Section 4.3
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Students will learn how to multiply decimals by decimals by: 1) Multiplying the numbers as normal 2) Counting the number of decimal places in the factors 3) Placing the decimal in the product the same number of places to the left.
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Section 4.3
- 1. Learning Target:Students will learn how to solve multiplication problems by multiply decimals by decimals.
- 2. Rule:Multiply like normal. Then count the number of place values behind (to the right) the decimal point in the problem.Start at the right of the product and move the decimal the number of placed to the left that you counted from in the step above.
- 4. Place the decimal in the correct location.16.36 3.7 = 60532
- 5. Answer: 16.36 3.7 = 60.532
- 6. Multiply. Use estimation to check your answer.12.7 2.9
- 7. Answer: 12.7 2.9Exact: 36.83Estimation: 13 3 = 39
- 8. Multiply. Use estimation to check your answer.7.03 4.62.125 0.00713.028 3.5
- 9. Answers:7.03 4.632.3387 5 = 352.125 0.0070.0148752 0 = 013.028 3.545.598 or 45.598013 4 = 52
- 10. Area Formula for a RectangleA = length widthA = lwA flag is 16.15 feet long and 8.5 feet wide. Find the area of the flag to the nearest ten square feet.
- 11. Answer: A = lwA= (16.15)(8.5)A = 137.275(to the nearest ten square feet) A = 137.275A = 140 square feet
- 12. Can you solve multiplication problems by multiply decimals by decimals?