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Estimating Decimal Product & Quotients (A) Unit 6 Lesson 1

Steps for Multiplying Decimals: • Remove the decimal point from the numbers. For example, if the numbers are 2.5 and 3.25, then convert 2.5 to 25 and 3.25 to 325. • Multiply the numbers together like usual. For the example, 25 multiplied by 325 equals 8,125. • Add the amount of decimal places in the beginning step. For the example, one decimal place was in 2.5 and two were in 3.25, resulting in three decimal places, or a decimal to the thousandths place. • Place the decimal point that many places to the left of the right end of the answer that corresponds to the appropriate decimal place. For the example, the number of decimal places is three and corresponds to the thousandths decimal place. Place the decimal point back into the answer three places to the left of the ones decimal place

Round factors to the nearest ten then estimate product 32.739 × 826.301

Round factors to the nearest whole number then estimate product 13.728 × 3.9

Use friendly numbers to estimatethe product. 0.217 × 0.352

Use friendly numbers to estimate the product. 71.62 × 0.51

Use friendly numbers to estimate the product. 5,498.021 × 9.87

Estimate the product. Choose the answer. Use friendly numbers to estimate the product of 21.21 × 999.201. • 20,000 B. 2,000 C. 200 D. 20

Which statement is true about the product? Rhonda was multiplying 6.3 by 0.1. A. It will be greater than 6.3. B. It will be equal to 6.3. C. I t will be less than 6.3. D. All of the above

Which statement is true about the product? Joan was multiplying 9.1 by 0.001 A. It will be more than 9.0. C. I t will be more than 0.090. B. It will be more than 0.90. D. I t will be more than 0.0090.

Round each factor to the nearest hundredth to estimate the product 31.614 ×3.497

QUESTIONS??

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