Decimals Worksheets. The decimal point separates the whole numbers from the fractional part of a number.


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1 Decimal Place Values The decimal point separates the whole numbers from the fractional part of a number In a whole number the decimal point is all the way to the right, even if it is not shown in a problem. =. The place values of the number 8.09 are shown below: ones tenths hundreds tens hundredths thousandths thousands 8.09 tenthousandths In word problems you will be asked to translate numbers from English. The word and is where the decimal point will go. Write the following numbers: Fiftyeight = 8 Onehundred twentyfive thousandths =. One hundred and twentyfive thousandths = 00.0 Eleven and three hundredths =.0 Six thousand forty and nine tenths = 6,040.9 MLC Page of
2 In the number , what digit is in the tenths place? 8 In the number , what digit is in the ones place? 9 In the number , what digit is in the tens place? In the number , what digit is in the thousandths place? 6 Exercise (answer key starts on page 9) ) In the number 78.9, what digit (number) is in the tenths place? ) In the number 78.9, what digit (number) is in the ones place? ) In the number 78.9, what digit (number) is in the tens place? 4) In the number , what digit is in the thousands place? ) In the number , what digit is in the thousandths place? 6) In the number , what digit is in the hundredths place? 7) In the number , what digit is in the tenths place? 8) In the number , what digit is in the ones place? 9) In the number , what digit is in the tens place? 0) In the number , what digit is in the hundreds place? Exercise Directions: translate the following numbers from English into decimal numbers. Twentynine. Eightyone hundredths. Nine thousand thirtyfour and seven tenths 4. One and four thousandths. One hundred and sixtytwo thousandths 6. Fortyfive hundredths 7. Four thousand three hundred twentyone tenthousandths 8. One hundred twenty and five tenths 9. Seventeen thousandths 0. One and seven tenths MLC Page of
3 Rounding Decimal Numbers When rounding decimal numbers, first look at the number place you are asked to round to. Then look at the digit (number) just to its right. If that digit is smaller than (0,,,, or 4), then do not round up. If the digit is or larger (, 6, 7, 8, 9), then round up. Round.69 to the nearest thousandth The place to round to.69 The digit is small..69 is the answer Do not round up. Round to the nearest thousandth The place to round to is the answer Drop everything to the right The digit 6 is large. Round up. Round to the nearest tenth The place to round to is the answer The digit 9 is large. Round up. Drop everything to the right Round to the nearest tenth The place to round to The digit 4 is small. Do not round up Drop everything to the right.0 is the answer Round to the nearest whole (ones) number The place to round to The digit 9 is large. Round up. 00 is the answer Drop everything to the right MLC Page of
4 Exercise Directions: Round the following decimal numbers to the place indicated ). to thousandths ).009 to thousandths ).096 to thousandths 4).4 to thousandths ) to thousandths 6) to thousandths 7) to thousandths 8). to hundredths 9).009 to hundredths 0). to hundredths ).67 to hundredths ) to hundredths ) to tenths 4).666 to tenths ). to tenths 6) to tenths 7). to whole (ones) number 8).99 to whole (ones) number 9) 499 to the nearest hundred 0) 999 to the nearest thousand MLC Page 4 of
5 Decimal/Fraction Conversion Changing fractions and mixed numbers to decimal numbers simply by dividing the denominator (bottom number) into the numerator (top number) = = = The whole number in front of the fraction will also be in front of the decimal. 9 Rounded to the nearest thousandth or Use repeating dash over the first =. Changing decimal numbers into fractions and mixed numbers is as easy as saying the number as a fraction then writing it down. Remember to reduce and simplify.. = two tenths = = = thirtyseven hundredths = = four hundred twenty thousandths = 8. = eighteen and thirtytwo hundredths = 40 = = MLC Page of
6 Exercise 4 Directions: Change the following fractions and mixed numbers to decimal numbers. Round answers to the nearest thousandth, if necessary. ) ) 9) ) 7 6) 0 0) ) 7) 6 7 ) 8 6 4) 6 8) 0 8 ) 6 Exercise Directions: Change the following decimal numbers to fractions or mixed numbers. Reduce answers, if possible. ). ).6 9).07 ). 6).6 0).87 ).8 7) 6. ) 4. 4).7 8). ) 7.7 MLC Page 6 of
7 Exercise 6 Directions: Fill in the chart below with equivalent fractions and decimal numbers. Reduce fraction answers, if possible. Round decimal answers to the nearest hundredth, if necessary. Fraction Decimal Fraction Decimal ) 6).00 4 ) 7) ) 8) ) 9) ) 0) 9. Arranging decimal numbers by size When comparing decimal numbers and arranging them in order it is usually easiest to line up the numbers vertically with the decimal points in a vertical line. If a number doesn t have a decimal point, place the decimal at the end. You may fill in blanks with zeroes to make the columns easier to line up. The same Which is larger.06 or.00899? added zeros is larger than 0; therefore,.06 is larger than is the answer MLC Page 7 of
8 Arrange from the smallest to the largest: The only clue here is that.8 does not have a whole number; therefore, it is the smallest In the tenths place.08 and.080 have zeroes; therefore, they are the next smallest numbers. Since.08 has a in the hundredths place, it is smaller. The two largest numbers are left over. Compare.80 and.00 by looking at hundredths place. Since.00 has a zero there, it is smaller and.80 is the largest of all the numbers. from smallest to largest, they are: Exercise 7 Directions: arrange these numbers from largest to smallest: ) ) ) ) ) MLC Page 8 of
9 Exercise 8 Directions: arrange these numbers from smallest to largest: ) ) ) ) ) Adding and Subtracting Decimal Numbers When adding and subtracting decimal numbers, line up the decimal point of all the numbers. If a number does not show a decimal point, place one to the right of the whole number. You may add zeroes to keep the columns lined up. Add.6 and 4.8 Add 47 and Add a zero Add zeroes Subtract 4.69 from The wording here can be confusing. Notice how subtract 4.69 from.06 means Add zeroes MLC Page 9 of
10 Exercise 9 Directions: add or subtract the following ) ) = ) = ) ) 46. = 6) = 7) = 8) = 9) = 0) ) ) 4..4 ) ) Subtract 6.8 from 4. ) Subtract 8.97 from 9 6) Add.00 to 87 7) Add 000 to.086 8) ) ) Subtract.00 from.0 MLC Page 0 of
11 Multiplying Decimal Numbers When multiplying decimal numbers, set up the problem like regular multiplication. When you get your answer, add up the total number of digits to the right of the decimals in both the numbers you are multiplying and place the decimal in your answer that many places from the right end three digits is the answer.0006 two digits 0 five digits is the answer 6.0 When multiplying three numbers together, multiply any two to get an answer; then multiply that answer by the third number two digits one digit three digits is the answer MLC Page of
12 Exercise 0 Directions: Multiply the following ).67. ) ) ).884 ) ) ) 8.4 8) ).4 0) ).00 ) 8.88 ).4 4) ) MLC Page of
13 Dividing Decimal Numbers Here are the three ways you will see division problems; they all mean the same thing: When dividing decimal numbers, move the decimal point in the divisor (number you re dividing by) to the right end of the divisor. Then move the decimal point in the dividend (the number you re dividing into) the same number of places to the right as you moved it in the divisor Once you have placed the decimal point correctly in your quotient (answer), divide like you would in whole numbers. Rounded to hundredth = = MLC Page of
14 Exercise Directions: Divide. Round answers to hundredths, if necessary )..69 ) ) ).4 80 ) 4 6) ) ) ) 9.0 0) ) 0. ). 8 ) ) ) MLC Page 4 of
15 Word Problems using Decimal Numbers Definitions: Sum the answer from adding numbers Difference the answer from subtracting numbers Product the answer from multiplying numbers Quotient the answer from dividing numbers In solving word problems, try to understand the whole situation being described. Some numbers may not even be involved in answering the question. Sometimes you will have to do extra steps to get the numbers you need to solve the problem. If the annual rainfall for a town near Santa Fe was. inches in 960,. inches in 96, and. in 96, what was the total rainfall for the three years?. Total means to add inches is the answer 7.0 What is the difference between David s salary of $.86 per month and Robert s monthly salary, which is $8.90? Difference means to subtract $04.96 is the answer If you have a car that used 9. gallons of gas to go 8 miles, how many miles per gallon (mpg) did the car get? (round your answer to the nearest tenth.) miles 8 miles mpg = = ; so divide 9. into 8 gallon 9. gallon mpg is the answer MLC Page of
16 You need to order three hinges for each of doors. Each hinge costs $.7. How much will the hinges cost? The total number of hinges is = 4 Multiply 4.7 =.7 $.7 is the answer Exercise ) During five days, you drive.4 miles, 4. miles, 0.4 miles, 8.7 miles, and 7. miles. How many miles did you drive during those five days? ) If you are given checks, one for $6.98, another for $7.7, and a third for $60, how much is the total of all checks? ) If a car gets 4. mpg on the highway, how many gallons of fuel will it use by traveling 40 highway miles? (round answer to tenths) 4) If you need to cut pieces of glass from a 4 feet length, how long should each piece be? ) If you purchase a TV and pay $40 down and $.60 a month for 8 months, what was the purchase price of the TV? 6) If the revenues from the extra ¼ % sales tax amounted to $48,6.47 in 98 and is to be divided equally among 7 different departments within the city of Albuquerque, how much will each department receive? (round to the nearest cent) 7) If the total precipitation (rainfall and snow) for the year at a mountain town is expected to be 7.9 inches and it has already rained 6.8 inches, how many more inches of precipitation are expected? MLC Page 6 of
17 Decimals Practice Test Change to decimals. (round to hundredths) ) ) ) 6 8 4) Change to fractions (reduce, if possible) ). 6).66 7).4 8) 4.87 Add 9) ) ) Subtract ) ) ) Subtract.97 from. Multiply ).8 x.78 6).6 x 74 7).0 x.67 x.9 Divide (round answers to hundredths) 8) ) ).7 MLC Page 7 of
18 ) Arrange from largest to smallest.808,.8,.809, ) Arrange from smallest to largest.6,.6,.06,.6,.66 ) Subtract four and threetenths from eleven and eightyone hundredths. 4) If you ran. miles on Monday,.9 miles on Wednesday, and 4.7 miles on Friday, how many miles did you run, total, for the three days? ) If you divided $6.6 evenly among five children, how much would each child get? 6) If you bought.6 gallons of gasoline at $.0 per gallon, how much did the gasoline cost? MLC Page 8 of
19 Answer Key Exercise Exercise Exercise ) 9 ) 9 ). ) 8 ).8 ).009 ) 7 ) ).00 4) 6 4).004 4). ) ) ) ) 0 6).4 6) ) 9 7).4 7).000 8) 4 8) 0. 8). 9) 7 9).07 9).0 0) 0).7 0). ).7 Exercise 4 Exercise ) ). ) 8.0 ) 4 ).86 ).67 4).88 ).7 6). ) 4).7 ) 4 ). 4) 4 6) 00.0 ) 4 7) 6) 8 8) 7).87 8) ).6 0).667 ).06 ) 6.6 7) ) 0 7 9) 00 0) 6 ) ) ) 00 0) 000 MLC Page 9 of
20 Exercise 6 Fraction Decimal Fraction Decimal ). 6) ).44 7) ). 4 8) ) ) ) ) Exercise 7 Exercise 8 Exercise 9 ) 6.,.6,.6,.06, 0.66 ) 7.8, 7.96, 8.04, 8., 8.7 ) 4. ) 40., 4., 4., 4.0,.40 ).00,.0,.00,.,. ) 6.96 ) ).0070,.007,.0067,.0068,.006 ) 9.909, 9.999, , 94, ).,,.,.09,.0 4) 6, 6., 6.8, 6.8, 6.8 4) 8.77 ).9,.,.09,.0, ).489,.48989,.4899,.48999,.49 ) ).07 7) 8).8 9) ) ) ).8766 ) 9.6 4) 7.4 ) 0.0 6) ) ) 69 9) ).009 MLC Page 0 of
21 Exercise 0 Exercise Exercise ).44 ). ) 76. miles ).886 ) 0 ) $4. ) ) 000 ) 8. gallons 4) ) 00 4).8 feet ).44 ).6 ) $ ).06 6).0 6) $ ).04 7) 7).08 inches 8).047 8). 9) 0. 9).0 0) 9.6 0). ) ).0 ) ) 8. ).4 ) ).00 4) 400 ).074 ).0 Practice Test ).4 ).84 ) $.7 ).7 4). 6) $. ).8 ) ). 6). ) 4 7).000 6) 0 8).70 7) 9).0 8) ).6 9).6 ).8,.808,.807,.809,.8 0) ).06,.6,.6,.6,.66 ).74 ) 7. ).9 4).9 miles MLC Page of
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