# CONFIDENTIAL1 “Multiplying Decimals By Decimals”

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• Multiplying Decimals By Decimals

CONFIDENTIAL

• WARM UP1)5.15 x 105 = 515,000

2) 3.14 x 7 = 21.98

3)0.007 x 6 = 0.042

4)99.99 x 3 = 299.97

CONFIDENTIAL

• Multiplying Decimals By Decimals

When multiplying a decimal by a decimal, multiply as with whole numbers.

To place the decimal point, find the sum of the number of decimal places in each factor.

The product has the same number of decimal places. Lets begin today

CONFIDENTIAL

• Multiplying Decimals

For example: Find 4.2 x 6.7 4.2x 6.7 294 252 28.14One decimal placeOne decimal placeTwo decimal placesThe product is 28.14. Compared to the estimate, the product is reasonable.Estimate 4.2 x 6.7 ->4x7 or 28

CONFIDENTIAL

• Multiplying Decimals By Decimals

Find 1.6 x 0.09 = 1.6x0.090.144 One decimal place Two decimal placeThree decimal placeLets practiceThe product is 0.144. Compared to the estimate, the product is reasonable.Estimate: 1.6 x 0.09= 2 x 0=0

CONFIDENTIAL

• Multiplying DecimalsYour turn! Multiply 0.014 x 3.7 0.014x 3.7 0.0518

CONFIDENTIAL

• Multiply:-1) 5.7 x 2.8 =15.962) 4.12 x 0.07=0.28843) 0.12 x 5.3 =0.636Practice Problems

CONFIDENTIAL

• Tea Break

CONFIDENTIAL

• Try to solve

http://www.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece-jigsaw/07-01-06-fworks3.html

CONFIDENTIAL

• Lets check what you understandNow, try to answer.

What is the number of decimal places in the product of 5.974 x 3.21 ?The number of decimal places in the product is 5

CONFIDENTIAL

• Assessment

2) 0.7 x 2.5 =1.751) 1.5 x 0.7 =1.05 3) 0.8 x 2.4 =1.924) 9.4 x 0.7 =6.585) 0.8 x 0.4 =0.326) 0.24 x 0.4 =0.096

CONFIDENTIAL

• Assessment

9) 2.6b, if b=2.057) 1.4x, if x = 0.0678) 0.04t, If t =3.210) 1.33c, if c =0.060.09380.1285.330.0798

CONFIDENTIAL

• Life Situation Problems11) Juan is buying a video game that costs \$32.99. The Sales Tax is found by multiplying the cost of the video game by 0.06. What is the cost of the sales tax for the video game? Cost of the Sales tax for the video game = \$ 32.99 x 0.06 = \$ 1.9794 =\$ 1.98

CONFIDENTIAL

• Lets recall what we studied today When multiplying a decimal by a decimal, multiply as with whole numbers. To place the decimal point, find the sum of the number of decimal places in each factor. The product has the same number of decimal places.

CONFIDENTIAL

• Wow! We studied a lot.

Thats all for today

Bye.

CONFIDENTIAL

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