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WARM UP

WARM UP. 1)5.15 x 10 5 = 515,000 2) 3.14 x 7 = 21.98 3)0.007 x 6 = 0.042 4)99.99 x 3 = 299.97. Let’s begin today. Multiplying Decimals By Decimals. When multiplying a decimal by a decimal, multiply as with whole numbers.

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WARM UP

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  1. WARM UP • 1)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 CONFIDENTIALDecimal Multiplication

  2. Let’s begin today 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. CONFIDENTIALDecimal Multiplication

  3. Multiplying Decimals • For example: Find 4.2 x 6.7 4.2 x 6.7 294 252 28.14 One decimal place Estimate 4.2 x 6.7 ->4x7 or 28 One decimal place Two decimal places The product is 28.14. Compared to the estimate, the product is reasonable. CONFIDENTIALDecimal Multiplication

  4. Multiplying Decimals By Decimals Let’s practice • Find 1.6 x 0.09 = 1.6 x0.09 0.144 One decimal place Estimate: 1.6 x 0.09= 2 x 0=0 Two decimal place Three decimal place The product is 0.144. Compared to the estimate, the product is reasonable. CONFIDENTIALDecimal Multiplication

  5. Multiplying Decimals • Your turn! Multiply 0.014 x 3.7 0.014 x 3.7 0.0518 CONFIDENTIALDecimal Multiplication

  6. Practice Problems Multiply:- 1) 5.7 x 2.8 =15.96 2) 4.12 x 0.07=0.2884 3) 0.12 x 5.3 =0.636 CONFIDENTIALDecimal Multiplication

  7. Tea Break CONFIDENTIALDecimal Multiplication

  8. Try to solve http://www.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece-jigsaw/07-01-06-fworks3.html CONFIDENTIALDecimal Multiplication

  9. Let’s check what you understand • Now, 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 CONFIDENTIALDecimal Multiplication

  10. Assessment 1) 1.5 x 0.7 =1.05 4) 9.4 x 0.7 =6.58 2) 0.7 x 2.5 =1.75 5) 0.8 x 0.4 =0.32 3) 0.8 x 2.4 =1.92 6) 0.24 x 0.4 =0.096 CONFIDENTIALDecimal Multiplication

  11. Assessment 7) 1.4x, if x = 0.067 8) 0.04t, If t =3.2 0.0938 0.128 9) 2.6b, if b=2.05 10) 1.33c, if c =0.06 5.33 0.0798 CONFIDENTIALDecimal Multiplication

  12. Life Situation Problems • 11) 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 CONFIDENTIALDecimal Multiplication

  13. Let’s 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. CONFIDENTIALDecimal Multiplication

  14. Wow! We studied a lot. That’s all for today Bye. CONFIDENTIALDecimal Multiplication

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