# one thousand, four AND six tenths three AND forty-two thousandths sixty-three ten-thousands Two hundred AND two hundreds 200.

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1 Section 4 Decimal Notation Place Value Chart hundred ten one tenth hundredth thousandth Ten thousandth Hundred thousandth Identify the place value for underlined digit: thousandths millionths hundreds Where is the decimal point for 65? After the one s place. 65. WORD NAMES FOR DECIMALS ) Left of decimal point Read as a whole number 2) Decimal Point = AND 3) Right of decimal point Read as whole number but followed by name of last decimal place one thousand, four AND six tenths three AND forty-two thousandths sixty-three ten-thousands Two hundred AND two hundreds ALEKS Chapter Four

2 Seventy-nine and sixteen thousandths CONVERTING A DECIMAL TO A MIXED NUMBER ) Digits to right of the decimal point are written as the NUMERATORS. 2) Place value of last digit determines the DENOMINATOR. 3) Whole number left unchanged. 4) Simply, if possible = = = = =3 =3 WRITING A DECIMAL NUMBER GREATER THAN AS A IMPROPER FRACTON ) DENOMINATOR is determined by the place value of the last digit. 2) NUMERATOR is determined by removing the decimal point. 3) Simplify = 5. ORDER 3 = 3.7 = 3 ) Start at left move to the right compare digits. 2) First instance where there is a difference. Larger = larger 2 ALEKS Chapter Four

3 Write the number from least to greatest. 3.7, 3.07, Compare tenth place: 0, 6, 9 therefore 3.07, 3.69, [ ] 4.59 > [ ] 28.4 < ROUNDING DECIMALS TO A PLACE VALUE ) Identify the digit one to RIGHT of place value. 2) If 5 to 9, then add to digit, discard the digits to right. 3) If to 4, discard digits to right Round to: Hundredths Ten-Thousandths Hundredths Thousandths Section 4 2 Addition and Subtraction of Decimals ADDING AND SUBTRACTING ) Line up the decimal point and write the numbers in columns. Add zeros as place holders after the last digit to right if needed. 2) Add or subtract. Decimal point aligns with the other decimal points. 3 ALEKS Chapter Four

4 = = ALEKS Chapter Four

5 Average Height of Girls Inches Age (years) What is the difference (-) in heights between 9 and 3? What is the difference (-) between and 9? = 4.75 inches = 5.25 inches Check Debit Credit Balance \$ \$82.50 \$ Pay \$54.02 \$ \$26.04 \$ What is X? X = = 4.5 feet What is Y? Y = = 2.5 feet What is perimeter? P = =8.2 5 ALEKS Chapter Four

6 Section 4 3 Multiplication of Decimals MULTIPLYING TWO DECIMALS ) Multiply as if whole number. 2) Count ALL the decimal places in all numbers. 3) Move the decimal point to the LEFT. May have to add ZERO s 2.72 (two) *.4 (one) = 3808 (three) = * 4. = est 20x4 = 80.9 * 29. = est 2x30 = * = MULTIPLYING BY FACTORS OF 0 (Divide by 0. s) Move the decimal point to the RIGHT the same number of ZERO s: 8.6 * 000 = 8, * 0,000 = * 0,000,000 = 23,960,000 MULTIPLYING BY FACTORS OF 0. (Divide by 0 s) Move the decimal point to the LEFT the same number of DECIMAL PLACES * 0.0 = ,437,24.5 * = * 0.00 = ALEKS Chapter Four

7 NAMING LARGE NUMBERS Million =,0000,000 = 6 ZERO s Billion =,000,000,000 = 9 ZERO s Trillion =,000,000,000,000 = 2 ZERO s.6 million.6 *,000,000 =,600, trillion 5.9 *,000,000,000,000 = 5,900,000,000,000 3 thousand 3 *,000 = 3,000 A book club ordered 2 book for \$8.99 each (*) and shipping cost (+) \$4.95. What was the total bill? T.B. = \$8.99 * 2 + \$4.95 T.B. = \$ \$4.95 T.B. = \$2.83 What is the area of the IMAX screen (A = LxW) which is 8m by 24.4m? A = 8m *24.4m = m 2 Section 4 4 Division of Decimals DIVIDING A DECIMAL BY A WHOLE NUMBER ) Place the decimal point in the quotient directly above the decimal point in the dividend. 2) Divide as you would whole numbers = = = ALEKS Chapter Four

8 How far to go in dividing? Look at answers on test. Have as many decimal places as the most of the problem. Terminating Decimal stop, i.e., end with ZERO s. Divisors with JUST Factors of 2 and/or 5 terminate. 2 = = 0.5 Repeating Decimal end in a repeating pattern FOREVER. 3 = = = = = = 5.8 DIVIDING WHEN THE DIVISOR IS NOT A WHOLE NUMBER ) Move the decimal point of the divisor to make it a whole number. 2) Move the decimal point of the dividend the SAME number of PLACES to RIGHT. 3) Divide = = = 6.6 DIVIDING BY POWERS OF 0 (Multiply by powers of 0. s) Move the Decimal Point to the LEFT the same number of ZERO s = = ALEKS Chapter Four

9 Round a Repeating Decimal. Use enough repeats of the decimal so that rounding is possible. Round to thousandths: Round quotient to hundreds: = = 8.37 A 46.5 ft cable is cut into 6 pieces ( ), how long is each piece? 46.5 ft 6 = 7.75 ft 200 m run in 2.3 sec. What is the speed in m/sec. Round to nearest tenth. = 9.38 m/sec. 9.4 m/sec Section 4 5 Fractions as Decimals Writing Fractions as Decimals: Just Divide. 3 8 =0.375 = =2.5 Just divide. 2 = 2 + = = = =0.8 2 = = = = ALEKS Chapter Four

10 Round to tenths =.28=.3 Round to hundredths =0.459=0.46 Decimal Fraction Section 4 6 Order of Operations and Application of Decimals PSMDAS nothing changed. ( ) 2=(.5) 2=2.25 2=0.25 Calculation with Decimals and Fractions ) Change everything to Decimal 2) Change everything to Fraction 3) Just Do it. 4.2 Method : Method 2: Method 3: 4.2 =4.2 = = = = = = =. =. =3.5 0 ALEKS Chapter Four

11 2.6 * ( ) =. (.5) = = = * ( ) = ( ) = = = Calculations with Round-0ff Errors 8.9 * = =7.56 or 8.9*0.44=8.36 or 8.9*0.444= * =. =8.4 (NO ERROR) Round to hundredths 4. =4. =. =.7083 =.7 Odometer read 46,25.9 mi, after 3 hr trip, the odometer read 46,947.4 mi. a) what is total distance (end-start) b) What is average speed in mph? a) 46, = 82.5 mi b) =. =62 h. A marathon is 26.2 miles long, an runner stops of the way (*). a) How many miles had he run? b) How many miles left? (-) a) 26.2 mi * = = 5.72 b) = 0.48 miles What is the average of wages: \$489.25, \$645.90, \$392.50, and \$ = = \$484.4 ALEKS Chapter Four

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Mastery Drill Tenths, Hundredths, and Thousandths You remember that and can be written as common fractions or as decimal fractions. = 0. 0 = 0.0 two two Mixed numbers in or can also be written both ways.

### Roselle Math Curriculum Unit Title: 7 Multiplying and Dividing Decimals Grade: _5_. Common Core Standards, 2010

Essential Question(s) How do decimal numbers impact multiplication and division? Enduring Understanding(s) Decimals can be multiplied and divided in the same way as whole numbers. What strategies can be