CONFIDENTIAL1 Today we will review “Multiplying & Dividing Decimals”

CONFIDENTIALCONFIDENTIAL 11

Today we will review Today we will review “Multiplying & Dividing Decimals” “Multiplying & Dividing Decimals”


Multiplying Decimals by Whole Multiplying Decimals by Whole NumbersNumbers

1) Multiply 0.65 x 61) Multiply 0.65 x 6 3.9



2) Multiply 9 x 0.0036 2) Multiply 9 x 0.0036 0.0324



3) Multiply 0.0198 x 2 3) Multiply 0.0198 x 2 0.0396



4) Ernesto bought 7 spiral notebooks. 4) Ernesto bought 7 spiral notebooks. Each notebook cost $2.29, including Each notebook cost $2.29, including tax. What was the total cost of the tax. What was the total cost of the notebooks? notebooks?

$16.03



5) Before sales tax, what is the total 5) Before sales tax, what is the total cost of three CDs selling for $13.98 cost of three CDs selling for $13.98 each?each?

$41.94


Multiplying Decimals by DecimalsMultiplying Decimals by Decimals

6)Multiply 27.43 x 1.0896)Multiply 27.43 x 1.089

29.87127



7) Multiply 0.45 x 0.0537) Multiply 0.45 x 0.053

0.02385



8) Multiply 0.45 x 0.058) Multiply 0.45 x 0.05

0.0225



9) A steamboat travels 36.5 miles 9) A steamboat travels 36.5 miles each day. How far will it travel in 6.5 each day. How far will it travel in 6.5 days?days?

237.25 miles



10) Juan is buying a video game that 10) Juan is buying a video game that costs $32.99. The sales tax is found costs $32.99. The sales tax is found by multiplying the cost of the video by multiplying the cost of the video game by 0.06. What is the cost of the game by 0.06. What is the cost of the sales tax for the video game?sales tax for the video game?

$1.98


Dividing Decimals by Whole Dividing Decimals by Whole NumbersNumbers

11) Divide. Round to the nearest tenth if 11) Divide. Round to the nearest tenth if necessary.necessary.

4.1119

0.6




22.2326

38.7




68.487

7.0



14) Four girls of a track team ran the 4-14) Four girls of a track team ran the 4-by-100 meter relay in a total of 46.8 by-100 meter relay in a total of 46.8 seconds. What was the average time for seconds. What was the average time for each runner?each runner?

11.7s



15) Tyler’s father has budgeted $64.50 for 15) Tyler’s father has budgeted $64.50 for his three children’s monthly allowance. his three children’s monthly allowance. Assuming they each earn the same Assuming they each earn the same amount, how much allowance will Tyler amount, how much allowance will Tyler receive?receive?

$21.50


Dividing Decimals by DecimalsDividing Decimals by Decimals16) Divide.16) Divide.

6.9642.0

230



0338.03.1

0.026



16728.04.3

0.0492


Dividing Decimals by DecimalsDividing Decimals by Decimals19) A flower garden is 11.25 meters long. 19) A flower garden is 11.25 meters long. Mrs. Owens wants to make a border along Mrs. Owens wants to make a border along one side using bricks that are 0.25 meter one side using bricks that are 0.25 meter long. How many bricks does she need?long. How many bricks does she need?

45 bricks


Dividing Decimals by DecimalsDividing Decimals by Decimals20) If a board 7.5 feet long is cut into 2.5 20) If a board 7.5 feet long is cut into 2.5 foot-pieces, how many pieces will there foot-pieces, how many pieces will there be?be?

3 pieces


Concept CheckConcept Check21) Choose the correct term or number to 21) Choose the correct term or number to complete each sentence.complete each sentence.

When (When (multiplyingmultiplying, dividing) two decimals, count the , dividing) two decimals, count the number of decimal places in each factor to number of decimal places in each factor to determine the number of decimal places in the determine the number of decimal places in the answer.answer.



To check your answer for a division problem, you can To check your answer for a division problem, you can multiply the quotient by the (dividend, multiply the quotient by the (dividend, divisordivisor).).



To change the divisor into a whole number, multiply To change the divisor into a whole number, multiply both the divisor and the dividend by the same power both the divisor and the dividend by the same power of (of (1010, 100), 100)



When dividing decimal by a whole number, place the When dividing decimal by a whole number, place the decimal point in the quotient directly (below, decimal point in the quotient directly (below, aboveabove) ) the decimal point found in the dividend.the decimal point found in the dividend.


More PracticeMore Practice25) You can drive your car 19.56 miles 25) You can drive your car 19.56 miles with one gallon of gasoline. How many with one gallon of gasoline. How many miles can you drive with 11.86 gallons of miles can you drive with 11.86 gallons of gasoline?gasoline?

231.98 mi


More PracticeMore Practice26) Ron paid $6.72 for 40 sheets of 26) Ron paid $6.72 for 40 sheets of stickers. What was the average price of stickers. What was the average price of each sheet of stickers rounded to the each sheet of stickers rounded to the nearest cent?nearest cent?

$0.17


More PracticeMore Practice27) Impulses in the human nervous 27) Impulses in the human nervous system travel at a rate of 188 miles per system travel at a rate of 188 miles per hour. Find the speed in miles per minute. hour. Find the speed in miles per minute. Round to the nearest hundredth.Round to the nearest hundredth.

3.13 miles per minute


More PracticeMore Practice28) The streets on Trevor’s block form a 28) The streets on Trevor’s block form a large square with each side measuring 0.3 large square with each side measuring 0.3 mile. If he walks around the block twice, mile. If he walks around the block twice, how far does he go?how far does he go?

2.4 mi


More PracticeMore Practice29) Nikki is buying some refrigerator 29) Nikki is buying some refrigerator magnets for her friends. Her total bill is magnets for her friends. Her total bill is $16.80. If magnets are $0.80 each, how $16.80. If magnets are $0.80 each, how many magnets is she buying?many magnets is she buying?

21 magnets


More PracticeMore Practice30) Matt is making a scale model of a 30) Matt is making a scale model of a building. The model is 3.4 feet tall. The building. The model is 3.4 feet tall. The actual building is 41.48 feet tall. How actual building is 41.48 feet tall. How many times smaller is the model than the many times smaller is the model than the actual building?actual building?

12.2 times smaller

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CONFIDENTIAL1 Today we will review “Multiplying & Dividing Decimals”