Estimate sums and differences

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What is estimation in mathematics?

Back

Estimation is a method used to find an approximate value that is close to the exact amount, often used for sums and differences.

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How do you round a number to the nearest whole number?

Back

To round a number to the nearest whole number, look at the digit in the tenths place. If it is 5 or greater, round up. If it is less than 5, round down.

Tags

CCSS.5.NBT.A.4

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Estimate the sum: 4.56 + 1.72 by rounding to the nearest whole number.

Back

4.56 rounds to 5 and 1.72 rounds to 2. So, 5 + 2 = 7.

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What is a benchmark in estimation?

Back

A benchmark is a reference point or a known value that helps in estimating other values, such as rounding to the nearest 5 or 10.

Front

Estimate the difference: 652 - 176 by rounding to the nearest ten.

Back

652 rounds to 650 and 176 rounds to 180. So, 650 - 180 = 470.

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What does it mean to estimate a fraction?

Back

Estimating a fraction involves finding a simpler fraction that is close in value to the original fraction, often by rounding.

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Back

Tags

CCSS.4.NF.A.2

Front

What is the purpose of using models in math problems?

Back

Models help visualize and understand mathematical concepts, making it easier to solve problems.

Tags

CCSS.2.OA.A.1

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How do you estimate the length of a song using benchmarks?

Back

Round the song lengths to the nearest half or whole number to simplify the estimation.

Front

What is the estimated length of a song that is 2.9 minutes long?

Back

Estimate it as 3 minutes.

Tags

CCSS.5.NBT.B.7