Estimating Decimal Products

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What is the process of estimating a product of two decimal numbers?

Back

To estimate the product of two decimal numbers, round each number to a convenient value (usually to the nearest whole number or to one decimal place) and then multiply the rounded numbers.

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CCSS.5.NBT.B.7

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How do you round 2.5 to the nearest whole number?

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2.5 rounds to 3 when rounding to the nearest whole number.

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CCSS.5.NBT.A.4

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What is the estimated product of 2.5 and 6.7 when rounded to the nearest whole numbers?

Back

The estimated product is 3 × 7 = 21.

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CCSS.5.NBT.B.7

Front

What is the estimated distance a helicopter can travel at 44.7 km/h for 2.5 hours?

Back

Estimate the distance by rounding 44.7 to 45 and calculating 45 × 2.5 = 112.5, which rounds to approximately 120 km.

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CCSS.5.NBT.B.7

Front

How do you estimate the product of 5.13 and 6.2?

Back

Round 5.13 to 5 and 6.2 to 6, then multiply: 5 × 6 = 30.

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CCSS.5.NBT.B.7

Front

What is the estimated product of 0.003 and 2.9?

Back

0.003 rounds to 0 when estimating, so the product is approximately 0.

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CCSS.5.NBT.B.7

Front

How do you round 6.09 to the nearest whole number?

Back

6.09 rounds to 6 when rounding to the nearest whole number.

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CCSS.5.NBT.A.4

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What is the estimated product of 6.09 and 0.82?

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Round 6.09 to 6 and 0.82 to 1, then multiply: 6 × 1 = 6.

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CCSS.5.NBT.B.7

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Why is estimating products useful in real-life applications?

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Estimating products helps in making quick calculations and decisions without needing exact numbers, which is useful in budgeting, planning, and time management.

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CCSS.4.NBT.B.5

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What is the importance of rounding in estimation?

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Rounding simplifies numbers, making mental calculations easier and faster, which is essential for estimation.

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CCSS.4.NBT.A.3

CCSS.3.NBT.A.1