Estimate sums and differences

Front

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.

Front

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.

Front

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.

Front

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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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.

Front

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.