# CALCULATIONS. Understand the operation of addition and the associated vocabulary, and its relationship to subtraction

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3 CALCULATIONS Pupils should be taught to: Understand the operation of subtraction and the associated vocabulary, and its relationship to addition As outcomes, Year 4 pupils should, for example: Use, read and write: take away, subtract, how many are left, how much less, difference between, how much more, how many more to make, decrease, inverse and the minus ( ) sign. Consolidate understanding of subtraction as: taking away; finding the difference between; complementary addition. Understand that: subtraction is non-commutative: that is, 5 7 is not the same as 7 5; when a larger number is subtracted from a smaller number, the answer is negative: for example, 3 8 = 5. Understand that: subtracting a (positive) number makes a number less: for example, is less than 260; subtracting zero leaves a number unchanged. Understand that subtraction is the inverse of addition and use this to check results. Respond rapidly to oral or written questions, explaining the strategy used. For example: 93 take away 8 Take 7 from subtract 46 Subtract 120 from less than less than 5437 What must I take from 84 to leave 26? What is the difference between 28 and 65? How many more than 234 is 249? How many less than 68 is 42? What must I add to 54 to make 93? Decrease 72 by add a number is 43. What is the number? Find pairs of numbers with a difference of 79 Complete written questions, for example: with rapid mental recall: = 43 = 4 = 11 using a number line or square, then mental strategies: = 65 = 87 = 54 using jottings or a pencil and paper method: = 1258 = 682 = 682 Use mental or written methods to: find the missing number in: 91 = 48 find all the different differences you can make by using two of these five numbers: 219, 193, 74, 156, 97 See also mental calculation strategies (pages 40 47) and checking results of calculations (page 72). 36

4 Understanding subtraction As outcomes, Year 5 pupils should, for example: As outcomes, Year 6 pupils should, for example: Respond rapidly to oral or written questions, explaining the strategy used. For example: 127 take away 35 Take 80 from subtract 105 Subtract 50 from less than 720. What must I take from 220 to leave 55? What is the difference between 155 and 390? How many more than 952 is 1050? How many less than 305 is 94? What must I add to 720 to make 908? Decrease 92 by add a number is 620. What is the number? Find pairs of numbers with a difference of 599 Respond rapidly to oral or written questions, explaining the strategy used. For example: 750 take away 255 Take 300 from subtract 2050 Subtract 2250 from less than less than What must I take from 8.4 to leave 2.6? What is the difference between 2.2 and 6.5? How much more than 23.4 is 24.9? How much less than 6.8 is 4.2? What must I add to 5.4 to make 9.3? Decrease 5.6 by add a number is 4.3. What is the number? Find pairs of numbers with a difference of 13.5 Complete written questions, for example: working rapidly, using known facts: 62 = = using informal pencil and paper jottings: 256 = 424 = 1.2 using a standard written method: = Complete written questions, for example: working rapidly, using known facts: 2.56 = = using informal pencil and paper jottings: 1475 = 2924 = 0.03 using a standard written method: = Use mental or written methods or a calculator to: find the missing number in: 931 = 746 find all the different differences you can make by using two of these five numbers: 8, 4008, 562, 3103, 95 Use mental or written methods or a calculator to: find the missing number in: 2485 = 4128 find all the different differences you can make by using two of these five numbers: 1.07, 0.3, 37.03, 17.73, 31.7 See also mental calculation strategies (pages 40 47) and checking results of calculations (page 73). See also mental calculation strategies (pages 40 47) and checking results of calculations (page 73). 37

5 CALCULATIONS Pupils should be taught to: Know, with rapid recall, addition and subtraction facts As outcomes, Year 4 pupils should, for example: Consolidate knowing by heart all addition and subtraction facts to 20. For example, recall rapidly all the pairs for 15: = = = = = = = = = = = = 7 For example, with rapid recall: say pairs of numbers with a total of 18; given a number, say how many more will make 17 altogether; say how many steps must be taken to get from 4 to 17 on a number line, or from 17 back to 4. Derive quickly related facts such as: = = = = 700 Derive quickly: number pairs that total 100: for example, or ; pairs of multiples of 50 that total 1000: for example, or Derive quickly addition doubles: doubles from to : for example, = 76; multiples of 10 from to : for example, = 580; multiples of 100 from to : for example, = See also doubling (page 58). 38

6 Rapid recall of addition and subtraction facts As outcomes, Year 5 pupils should, for example: As outcomes, Year 6 pupils should, for example: Derive quickly related facts such as: = = = = = = 0.7 Derive quickly, or continue to derive quickly: two-digit pairs that total 100: for example, or ; pairs of multiples of 50 that total 1000: for example, or ; decimals (tenths) with a total of 1: for example, or ; decimals (ones and tenths) with a total of 10: for example, or Derive quickly addition doubles: doubles from to : for example, = 156; multiples of 10 from to : for example, = 1560; multiples of 100 from to : for example, = See also doubling (page 59). 39

7 CALCULATIONS Pupils should be taught to: Find a difference by counting up through the next multiple of 10, 100 or 1000 As outcomes, Year 4 pupils should, for example: For example, work out mentally by counting up from the smaller to the larger number: 92 89, , Count on or back in repeated steps of 1, 10, 100, 1000 For example, work out mentally that: = 1995 by counting back in ones from 2003; = 693 by counting on in tens from 643; = 337 by counting back in tens from 387; = 960 by counting on in hundreds from 460. Partition into hundreds, tens and ones For example, work out mentally that: = 82 because it is = 70 and = 12, making = 82, or it is = = 82; = = 58 3 = 55. Identify near doubles For example, work out mentally that: = 74 double 40, subtract 2, subtract 4, or double 37; = 330 two 160s plus 10, or two 170s minus 10; = 760 double 350 plus double 30, or double 400 minus double 20. Add or subtract the nearest multiple of 10, 100 or 1000 and adjust Add 9, 19, 29 or 11, 21, 31 to any two-digit number: = 92 because it is the same as ; = 129 because it is the same as Subtract 9, 19, 29 or 11, 21, 31 from any two- or three-digit number: = 65 because it is the same as ; = 212 because it is the same as For example, work out mentally that: = 132 because it is = = 132; = 61 because it is = =

8 Mental calculation strategies (+ and ) As outcomes, Year 5 pupils should, for example: For example, work out mentally by counting up from the smaller to the larger number: , As outcomes, Year 6 pupils should, for example: For example, work out mentally by counting up from the smaller to the larger number: is = 5215 For example, work out mentally that: = 382 because it is = 370 and = 12, or = 382, or it is = = 382; = = = 385, or it is = = = 385. For example, work out mentally that: = 3.1 double 1.5 plus 0.1. For example, work out mentally that: = 808 double 400 plus 21 minus 13. Continue to add/subtract 9, 19, 29 or 11, 21, 31 by adding/subtracting 10, 20, 30 then adjusting by = 529 because it is the same as ; = 512 because it is the same as Add/subtract 0.9, 1.9, 2.9 or 1.1, 2.1, 3.1 by adding or subtracting 1, 2, 3 then adjusting by 0.1. For example, work out mentally that: = 370 because it is = = 370; = 2008 because it is = =

9 CALCULATIONS Pupils should be taught to: Use the relationship between addition and subtraction As outcomes, Year 4 pupils should, for example: Continue to recognise that knowing one of: = = = = 19 means that you also know the other three. Work out mentally one fact such as or 91 25, and then state three other related facts. Working mentally, answer oral questions like: You know that = 70. What is: , or 70 56, or 70 14? You know that = 58. What is: 83 58, or , or ? Use the numbers 25, 37, 52, 77, 87. Write as many different addition or subtraction statements as you can. Add several numbers Add mentally several small numbers: for example, or Work mentally to complete questions like: = = using strategies such as: looking for pairs that make 10 or 100 and doing these first; starting with the largest number; looking for pairs that make 9 or 11, and adding these to the total by adding 10 and then adjusting by 1. Add a set of numbers such as , recognising this as equivalent to 6 4. Explain your strategies. 42

11 CALCULATIONS Pupils should be taught to: Use known number facts and place value to add or subtract a pair of numbers mentally As outcomes, Year 4 pupils should, for example: Continue to add or subtract two-digit multiples of 10 Respond to oral questions like: = = 80 Add or subtract a pair of multiples of 100, crossing 1000 Respond to oral questions like: = = = 900 Revise adding/subtracting a multiple of 10 to/from a two- or three-digit number, without crossing the hundreds boundary Respond to oral questions like: = 52 + = = = 76 = = 36 Revise adding a two- or three-digit number to a multiple of 10, 100 or 1000 Respond to oral questions like: = = = = = = 637 Find what to add to a two- or three-digit number to make 100 or the next higher multiple of 100 Respond to oral questions and explain method: What must be added to 37 to make 100? 432 to make 500? 58 + = = = 800 Find what to add to a four-digit multiple of 100 to make the next higher multiple of 1000 Respond to oral questions like: What must be added to 7300 to make 8000? = = 9000 Use and apply these skills in a variety of contexts, in mathematics and other subjects. 44

13 CALCULATIONS Pupils should be taught to: Use known number facts and place value to add or subtract a pair of numbers mentally (continued) As outcomes, Year 4 pupils should, for example: Add a single digit to any three- or four-digit number, crossing the tens boundary Respond to oral questions like: = = = = = = 1254 Subtract a single digit from a multiple of 100 or 1000 Respond to oral questions like: = 600 = = = 5000 = = 4997 Subtract a single digit from a three- or four-digit number, crossing the tens boundary Respond to oral questions like: = 626 = = = 5952 = = 5949 Find a small difference between a pair of numbers lying either side of a multiple of 1000 For example, work out mentally that: = 15 by counting up 2 from 6988 to 6990, then 10 to 7000, then 3 to = 6004 = = 19 Add or subtract any pair of two-digit numbers, including crossing the tens boundary Respond to oral questions like: = 45 + = = = 92 = = 67 Use and apply these skills in a variety of contexts, in mathematics and other subjects. 46

14 Mental calculation strategies (+ and ) As outcomes, Year 5 pupils should, for example: As outcomes, Year 6 pupils should, for example: Find the difference between a pair of numbers lying either side of a multiple of 1000 For example, work out mentally that: = 104 by counting up 1 from 6899 to 6900, then 100 to 7000, then 3 to = 8004 = = 19 Add or subtract a pair of decimal fractions each with units and tenths, or with tenths and hundredths, including crossing the units boundary or the tenths boundary Respond to oral questions like: = = = 0.95 = 0.67 Add or subtract a pair of decimal fractions each less than 1 and with up to two decimal places Respond to oral questions like: = = = 0.5 = 0.19 Use and apply these skills in a variety of contexts, in mathematics and other subjects. Use and apply these skills in a variety of contexts, in mathematics and other subjects. 47

15 CALCULATIONS Pupils should be taught to: Develop and refine written methods for addition, building on mental methods As outcomes, Year 4 pupils should, for example: Informal written methods Use pencil and paper methods to support, record or explain calculations, achieving consistent accuracy. Discuss, explain and compare methods. Where calculations are set out in columns, know that units should line up under units, tens under tens, and so on HTU + TU, then HTU + HTU Do this crossing the tens boundary, or the hundreds boundary, or both. For example: A: adding the most significant digits first ] ] add mentally ] from top B: compensation (add too much, take off) ( ) 14 (86 100) 840 Standard written methods Develop an efficient standard method that can be applied generally. For example: C: adding the least significant digits, preparing for carrying leading to carrying below the line Using similar methods, add several numbers with different numbers of digits. For example, find the total of: 83, 256, 4, 57. Extend to decimals Using methods similar to those above, begin to add two or more three-digit sums of money, with or without adjustment from the pence to the pounds. Know that decimal points should line up under each other, particularly when adding or subtracting mixed amounts such as 3.59 ± 78p. For example:

17 CALCULATIONS Pupils should be taught to: Develop and refine written methods for subtraction, building on mental methods As outcomes, Year 4 pupils should, for example: Informal written methods Use pencil and paper methods to support, record or explain calculations, achieving consistent accuracy. Discuss, explain and compare methods. Where calculations are set out in columns, know that units should line up under units, tens under tens, and so on HTU TU, then HTU HTU Do this crossing the tens or the hundreds boundary, or both. A: counting up (complementary addition) to make to make to make to make to make B: compensation (take too much, add back) ( ) +14 (since = 14) 668 Standard written methods Develop an efficient standard method that can be applied generally. For example: C: decomposition leading to 754 = = adjust from T to U = adjust from H to T = Subtract numbers with different numbers of digits. For example, find the difference between: 671 and 58, 46 and 518. Extend to decimals Using methods similar to those above, begin to find the difference between two three-digit sums of money, with or without adjustment from the pence to the pounds. Know that decimal points should line up under each other. For example:

18 Pencil and paper procedures (subtraction) As outcomes, Year 5 pupils should, for example: Informal written methods Use pencil and paper methods to support, record or explain calculations, achieving consistent accuracy. Discuss, explain and compare methods. Where calculations are set out in columns, know that units should line up under units, and so on HTU HTU, then ThHTU ThHTU For example: A: counting up leading to to make (300) 400 to make (754) 54 to make B: compensation (take too much, add back) ( ) +14 (since = 14) 468 As outcomes, Year 6 pupils should, for example: Informal written methods Use pencil and paper methods to support, record or explain calculations, achieving consistent accuracy. Discuss, explain and compare methods. Where calculations are set out in columns, know that units should line up under units, and so on ThHTU ThHTU, then with any number of digits For example: A: counting up (complementary addition) 6467 or (2700) 16 (2700) 300 (3000) 300 (3000) 3467 (6467) 3467 (6467) B: compensation (take too much, add back) ( ) +316 (since = 316) 3783 Standard written methods Continue to develop an efficient standard method that can be applied generally. For example: C: decomposition 754 = leading to = = Standard written methods Continue to develop an efficient standard method that can be applied generally. For example: C: decomposition Subtract numbers with different numbers of digits. For example, find the difference between: 764 and 5821, 4567 and 893. Subtract numbers with different numbers of digits. For example, find the difference between: and Extend to decimals Using the chosen method, find the difference between two decimal fractions with up to three digits and the same number of decimal places. Know that decimal points should line up under each other. For example: km 4.6 km Extend to decimals Using the chosen method, subtract two or more decimal fractions with up to three digits and either one or two decimal places. Know that decimal points should line up under each other. For example:

19 CALCULATIONS Pupils should be taught to: Understand the operation of multiplication and the associated vocabulary, and its relationship to addition and division As outcomes, Year 4 pupils should, for example: Use, read and write: times, multiply, multiplied by, product, multiple, inverse and the sign. Understand and use when appropriate the principles (but not the names) of the commutative, associative and distributive laws as they apply to multiplication: Example of commutative law 8 15 = 15 8 Example of associative law 6 15 = 6 (5 3) = (6 5) 3 = 30 3 = 90 Example of distributive law 18 5 = (10 + 8) 5 = (10 5) + (8 5) = = 90 Understand that: is equivalent to 86 3 or 3 86; multiplication by 1 leaves a number unchanged; multiplication of zero results in zero. Understand that multiplication is the inverse of division (multiplication reverses division and vice versa) and use this to check results. See also mental calculation strategies (pages 60 65) and checking results of calculations (page 72). Respond rapidly to oral or written questions, explaining the strategy used. For example: Two elevens. Double times 4 9 multiplied by 3. Multiply 15 by 6 by zero by 1. Is 40 a multiple of 5? How do you know? What is the product of 15 and 6? Find all the different products you can make by using two of these five numbers: 2, 3, 4, 5, 10. Complete written questions, for example: working rapidly, using known facts: 7 2 = 10 = 80 5 = = 3 = 24 4 = 20 using pencil and paper jottings and/or mental strategies: 90 6 = 8 = = = 24 progressing to: = = =

20 Understanding multiplication As outcomes, Year 5 pupils should, for example: Use, read and write, spelling correctly: times, multiply, multiplied by, product, multiple, inverse and the sign. As outcomes, Year 6 pupils should, for example: Use, read and write, spelling correctly: times, multiply, multiplied by, product, multiple, inverse and the sign. Understand and use as appropriate the principles (but not the names) of the commutative, associative and distributive laws as they apply to multiplication: Example of commutative law 8 65 = 65 8 Example of associative law = (2 7) 12 = 2 (7 12) = 2 84 = 168 Examples of distributive law 26 7 = (20 + 6) 7 = (20 7) + (6 7) = 182 (6 15) + (4 15) = = 150 Understand and use when appropriate the principles (but not the names) of the commutative, associative and distributive laws as they apply to multiplication: Example of commutative law = Example of associative law = 10.4 (10 4) or ( ) 4 Example of distributive law = 46 (100 2) = (46 100) (46 2) = = 4508 Understand that, with positive whole numbers, multiplying makes a number larger. Understand that multiplication is the inverse of division and use this to check results. Understand that multiplication is the inverse of division and use this to check results. See also mental calculation strategies (pages 60 65) and checking results of calculations (page 73). See also mental calculation strategies (pages 60 65) and checking results of calculations (page 73). Start to use brackets: know that they determine the order of operations, and that their contents are worked out first. For example: 3 + (6 5) = 33, whereas (3 + 6) 5 = 45. Respond rapidly to oral or written questions, explaining the strategy used. For example: Two twelves. Double times 8 9 multiplied by 7. Multiply 31 by 8 by zero by 1. Is 81 a multiple of 3? How do you know? What is the product of 25 and 4? Find all the different products you can make by using three of these: 6, 7, 8, 9, 11. Use brackets: know that they determine the order of operations, and that their contents are worked out first. Respond rapidly to oral or written questions, explaining the strategy used. For example: Two nineteens. Double times 8 9 multiplied by 8. Multiply 25 by 8 by zero by 1. Is 210 a multiple of 6? How do you know? What is the product of 125 and 4? Find all the different products you can make using two of these: 0.2, 1.4, 0.03, 1.5, 0.5. Complete written questions, for example: working rapidly, using pencil and paper jottings and/or mental strategies: 70 6 = 11 = 88 9 = = 6 = = 0.49 using informal or standard written methods: 72 6 = 180 = = = = Complete written questions, for example: working rapidly, using pencil and paper jottings and/or mental strategies: = 20 = = = 0.3 = = 2 using informal or standard written methods: = 9 = = = 190 Use written methods or a calculator to work out: = = = (14 60) + = 850 Use written methods or a calculator to work out: = = 9506 (41 76) + = (97 42) = 53

21 CALCULATIONS Pupils should be taught to: Understand the operation of division and the associated vocabulary, and its relationship to subtraction and multiplication As outcomes, Year 4 pupils should, for example: Use, read and write: share, group, divide, divided by, divided into, divisible by, factor, quotient, remainder, inverse and the division signs or /. Understand the operation of division either as sharing equally or as grouping (that is, repeated subtraction). For example, 30 6 can be modelled as: sharing among 6 and the number given to one person counted; or groups or lots of 6 being taken and the number of groups or lots counted. Understand that: division by 1 leaves a number unchanged. Understand that division is the inverse of multiplication (division reverses multiplication and vice versa) and use this to check results. See also mental calculation strategies (pages 60 65) and checking results of calculations (page 72). Respond to oral or written questions, explaining the strategy used. For example: Share 44 between 4. Divide 69 by divided by 3. Divide 3 into 69. How many groups of 6 can be made from 48? How many lengths of 10 cm can you cut from 183 cm? Is 72 divisible by 3? How do you know? What are the factors of 12? Tell me two numbers with a quotient of 5. Are there any other possibilities? Begin to relate division and fractions. Understand that: 1 2 of 10 is the same as 10 2; 1 4 of 3 is the same as 3 4. Complete written questions, for example: with rapid mental recall: 36 4 = 60 = 6 3 = 7 using pencil and paper jottings and/or mental strategies: = 240 = = 8 (25 ) + 2 = 7 ( 5) 2 = 3 progressing to: = 156 = 26 9 =

22 Understanding division As outcomes, Year 5 pupils should, for example: Use, read and write, spelling correctly: share, group, divide, divided by, divided into, divisible by, factor, quotient, remainder, inverse and the division signs or /. Understand the operation of division as either sharing equally or repeated subtraction (grouping): sharing is better for dividing by small numbers; grouping is better for dividing by larger numbers. As outcomes, Year 6 pupils should, for example: Use, read and write, spelling correctly: share, group, divide, divided by, divided into, divisible by, factor, quotient, remainder, inverse and the division signs or /. Continue to understand the operation of division as either sharing or repeated subtraction (grouping): sharing is better for dividing by small numbers; grouping is better for dividing by larger numbers. Understand that: with positive whole numbers, division makes a number smaller; division is non-commutative: that is, 72 9 is not the same as 9 72; a number cannot be divided by zero. Understand that division is the inverse of multiplication and use this to check results. Understand that division is the inverse of multiplication and use this to check results. See also mental calculation strategies (pages 60 65) and checking results of calculations (page 73). See also mental calculation strategies (pages 60 65) and checking results of calculations (page 73). Respond to oral or written questions, explaining the strategy used. For example: Share 48 between 8. Divide 56 by 7. Divide 3 into 72. How many groups of 8 can be made from 73? What is the remainder when 74 is divided by 8? How many lengths of 20 cm can you cut from 270 cm? Is 156 divisible by 6? How do you know? What are the factors of 36? Tell me two numbers with a quotient of 100. Respond to oral or written questions, explaining the strategy used. For example: Share 108 between 9. Divide 112 by 7. Divide 15 into 225. How many groups of 16 can be made from 100? What is the remainder when 104 is divided by 12? How many lengths of 25 cm can you cut from 625 cm? Is 156 divisible by 8? How do you know? What are the factors of 98? Tell me two numbers with a quotient of 0.5. Relate division and fractions. Understand that: 1 3 of 24 is equivalent to 24 3 or 24 3; 16 5 is equivalent to 16 5 or Relate division and fractions. Understand that: 1 8 of 72 is equivalent to 72 8 or 72 8; 4 7 is equivalent to 4 7; 13 7 is equivalent to Complete written questions, for example: with rapid mental recall: 63 7 = 56 = 8 9 = 8 using pencil and paper jottings and/or mental strategies: = 54 = = 90 Complete written questions, for example: with rapid mental recall: = 9.9 = = 0.8 using pencil and paper jottings and/or mental strategies: = 25 = 39 Use written methods or a calculator to work out: (125 ) + 2 = 27 ( 5) 22 = = 1560 = = 46 Use written methods or a calculator to work out: = 2.8 = 4.6 ( 25) 22 = 30 ( )/(133 85) (100 ) + 5 =

23 CALCULATIONS Pupils should be taught to: Understand the idea of a remainder, and when to round up or down after division As outcomes, Year 4 pupils should, for example: Give a remainder as a whole number. For example: 41 4 is 10 remainder 1 28 = (5 5) is 14 remainder 2 97 = (9 10) is 7 remainder = (3 100) + There are 64 children in Year 5. How many teams of 6 children can be made? How many children will be left over? Divide a whole number of pounds by 2, 4, 5 or 10. For example: Four children collected 19 for charity. They each collected the same amount. How much did each one collect? ( 4.75) Decide what to do after division and round up or down accordingly Make sensible decisions about rounding up or down after division. For example, 62 8 is 7 remainder 6, but whether the answer should be rounded up to 8 or rounded down to 7 depends on the context. Examples of rounding down I have 62. Tickets cost 8 each = 7 remainder 6. I can buy only 7 tickets. I have 62 cakes. One box holds 8 cakes. I could fill only 7 boxes of cakes. Examples of rounding up I have 62 cakes. One box holds 8 cakes. I will need 8 boxes to hold all 62 cakes. There are 62 people. There are 8 seats in a row. 8 rows of seats are needed to seat everyone. See also rounding whole numbers (page 12). 56

25 CALCULATIONS Pupils should be taught to: Know multiplication facts by heart and derive quickly the corresponding division facts As outcomes, Year 4 pupils should, for example: Know by heart multiplication facts for the 2, 3, 4, 5 and 10 timestables, up to 10, including multiplication by 0 and 1, and begin to know them for the 6, 7, 8 and 9 times-tables. Derive quickly the corresponding division facts. Respond rapidly to oral or written questions like: Nine fives. 3 times 7 times 0. 4 multiplied by 8 by 0. Multiply 9 by 5 by 1. Respond quickly to questions like: Divide 36 by 4. What is 24 shared between 3? How many fives in 55? Half of 17. One quarter of 3. Know by heart or derive rapidly doubles and halves Use, read and write: double, twice, half, halve, whole, divide by 2, divide into 2 and 1 2 as one half. Understand that halving is the inverse of doubling: for example, if half of 18 is 9, then double 9 is 18. Know by heart or derive quickly: doubles of all numbers 1 to 50; doubles of multiples of 10 up to 500; doubles of multiples of 100 up to 5000; and all the corresponding halves. Respond rapidly to oral or written questions like: Double Half of 38 of 150 of 700 of of 700 of 34 Twice 95. Jo spent half of her savings. How much did she spend? How many metres is half a kilometre? Complete written questions, for example: working quickly, using known facts: 60 2 = 160 = 80 using cubes or a number line, then mental strategies: 74 2 = 72 2 = 2 = = 37 58

26 Rapid recall of multiplication and division facts As outcomes, Year 5 pupils should, for example: Know by heart all multiplication facts up to 10 10, including multiplication by 0 and 1. Derive quickly the corresponding division facts. As outcomes, Year 6 pupils should, for example: Continue to know by heart all multiplication facts up to 10 10, including multiplication by 0 and 1. Derive quickly the corresponding division facts. Know by heart the squares of all numbers from 1 1 to Know by heart the squares of all numbers from 1 1 to Derive quickly squares of multiples of 10 to 100, such as 20 2, Respond rapidly to oral or written questions like: Nine sevens. How many eights in 48? 6 times 7. 5 multiplied by 9. Multiply 9 by 6. 7 multiplied by 0. Respond quickly to questions like: Divide 38 by 9. What is 48 shared between 8? Three divided by 5. One seventh of 35. Respond rapidly to oral or written questions like: Nine eights. How many sevens in 35? 8 times 8. 6 multiplied by 7. Multiply 11 by 8. Respond quickly to questions like: 7 multiplied by 0.8 by 0. Multiply 0.9 by 0.6 by 0. Divide 3.6 by 9 by 1. What is 88 shared between 8? Divide 6 into divided by times 7 times 2. One twentieth of 360. Use, read and write, spelling correctly: double, twice, half, halve, whole, divide by 2, divide into 2 and 1 2 as one half. Understand that halving is the inverse of doubling: for example, if half of 72 is 36, then double 36 is 72. Use, read and write, spelling correctly: double, twice, half, halve, whole, divide by 2, divide into 2 and 1 2 as one half. Understand that halving is the inverse of doubling: for example, if half of 0.3 is 0.15, then double 0.15 is 0.3. Know by heart or derive quickly: doubles of all numbers 1 to 100; doubles of multiples of 10 up to 1000; doubles of multiples of 100 up to ; and all the corresponding halves. Know by heart or derive quickly: doubles of two-digit whole numbers or decimals; doubles of multiples of 10 up to 1000; doubles of multiples of 100 up to ; and all the corresponding halves. Respond rapidly to oral or written questions like: Double Half of 154 of 820 of 5600 Twice of 920. Half of one half. What is half of 71.30? How many millimetres is half a metre? Respond rapidly to oral or written questions like: Double Twice of 9.5. Half of one eighth. What is half of 581? What fraction of 1 cm is half a millimetre? Complete written questions, for example: working quickly, using mental strategies: = 1600 = = = = 2 = 65 2 = = 330 Complete written questions, for example: working quickly, using mental strategies: = 1750 = = = = 2 = = =

27 CALCULATIONS Pupils should be taught to: Use related facts and doubling or halving As outcomes, Year 4 pupils should, for example: Use related facts and doubling or halving. For example: double 34 is double 30 add double 4, or = 68; half of 56 is half of 50 plus half of 6. For example: To multiply by 4, double and double again. For example, to work out 12 4, say 12, 24, 48. To multiply by 5, multiply by 10 and halve. For example: 14 5 = 14 (10 2) = (14 10) 2 = = 70 To multiply by 20, multiply by 10 and then double. For example: = 14 (10 2) = (14 10) 2 = = 280 Work out the 8 times-table facts by doubling the 4 times-table facts. Work out some multiples of 15 by doubling: 1 15 = 15 so 2 15 = = = = 240 Use combinations of these facts to work out, say, = (8 15) + (2 15) + (1 15) = 165. Explain how to find quarters and eighths by halving. For example, work out mentally that: one eighth of 64 is 8 (half of 64 is 32, half again is 16, half again is 8); one quarter of 600 is 150 (because one half of 600 is 300 and half again is 150). Use factors 60

28 Mental calculation strategies ( and ) As outcomes, Year 5 pupils should, for example: Use related facts and doubling/halving. For example: double 78 = double 70 + double 8 = = 156; half of 256 = half of half of 50 + half of 6 = 128. As outcomes, Year 6 pupils should, for example: Use related facts and doubling/halving. For example: double 176 = = 352; half of 948 = half of half of 40 + half of 8 = 474. For example: Double a number ending in 5, and halve the other number. For example: 16 5 is equivalent to 8 10 = is equivalent to 70 7 = 490 Halve an even number in the calculation, find the product, then double it. For example: = = = = 816 To multiply by 50, multiply by 100, then halve. For example: = = 1800 For example: Double a number ending in 5, and halve the other number. Halve/double one number in the calculation, find the product, then double/halve it. To multiply by 15, multiply by 10, halve the result, then add the two parts together. For example: = = = 210 Alternatively, multiply by 30, then divide by 2. To multiply by 25, multiply by 100, then divide by 4. For example: = = 975 Work out the 16 times-table facts by doubling the 8 times-table facts. Work out the 24 times-table facts by doubling the 6 times-table facts and doubling again. Work out: 1 25 = 25 and so deduce that 2 25 = = = = 400 Use combinations of these facts to work out, say, = (16 25) + (8 25) + (1 25) = 625. Work out: 1 32 = 32 and so deduce that 2 32 = = = = 512 Use combinations of these facts to work out other multiples of 32. Explain how to find sixths by halving thirds, or twentieths by halving tenths. For example, work out mentally that: one sixth of 300 is 50 (one third of 300 is 100, half of that is 50); one twentieth of 900 is 45 (one tenth is 90, and half of that is 45). Explain how to find sixths and twelfths by halving thirds, or twentieths by halving tenths. For example, work out mentally that: one twelfth of 300 is 25 (one third of 300 is 100, half is 50, half again is 25); one twentieth of 150 is (one tenth is 15, and half of that is 7 1 2). Use factors. For example: = = = = = = 15 Use factors. For example: = = = = = = 18 61

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