Estimating Multiplication with Decimals

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What is estimation in multiplication?

Back

Estimation in multiplication is a method used to find an approximate value of a product rather than an exact answer, often by rounding numbers to make calculations easier.

Tags

CCSS.4.NBT.B.5

Front

How do you estimate the product of two decimal numbers?

Back

To estimate the product of two decimal numbers, round each number to the nearest whole number and then multiply the rounded numbers.

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CCSS.5.NBT.B.7

Front

Estimate 9.94 x 6.6 by rounding.

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10 x 7 = 70.

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CCSS.5.NBT.B.7

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Estimate 2.12 x 0.887 by rounding.

Back

2 x 1 = 2.

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CCSS.5.NBT.B.7

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Estimate 4.476 x 0.9 by rounding.

Back

4 x 1 = 4.

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CCSS.5.NBT.B.7

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Estimate 8.65 x 0.4 by rounding.

Back

9 x 0 = 0.

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CCSS.5.NBT.B.7

Front

Estimate 8.5 x 0.61 by rounding.

Back

9 x 1 = 9.

Tags

CCSS.5.NBT.B.7

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What is the importance of estimating products?

Back

Estimating products helps to quickly assess the reasonableness of answers and simplifies calculations in real-life situations.

Tags

CCSS.4.NBT.B.5

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What is rounding?

Back

Rounding is the process of adjusting the digits of a number to make it simpler while keeping its value close to what it was.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

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When should you use estimation?

Back

Use estimation when you need a quick answer, when exact numbers are not necessary, or when checking the reasonableness of a calculated answer.