2022-23 Estimating Sums and Differences

Front

What is estimating sums?

Back

Estimating sums involves rounding numbers to make them easier to add, allowing for a quick approximation of the total.

Front

How do you estimate the sum of 4,982 + 981 to the nearest thousand?

Back

Round 4,982 to 5,000 and 981 to 1,000. The estimated sum is 5,000 + 1,000 = 6,000.

Front

What is estimating differences?

Back

Estimating differences involves rounding numbers to make them easier to subtract, providing a quick approximation of the difference.

Front

How do you estimate the difference between 129 and 47?

Back

Round 129 to 130 and 47 to 50. The estimated difference is 130 - 50 = 80.

Front

What does it mean to round to the nearest thousand?

Back

Rounding to the nearest thousand means adjusting a number to the closest multiple of 1,000.

Front

Estimate the sum of 43,289 + 58,097 to the nearest ten thousand.

Back

Round 43,289 to 40,000 and 58,097 to 60,000. The estimated sum is 40,000 + 60,000 = 100,000.

Front

How do you estimate how many more people attended the play than the concert?

Back

Round 2,691 to 2,700 and 1,521 to 1,500. The estimated difference is 2,700 - 1,500 = 1,200.

Front

What is the estimated difference between 8,749 and 14,497 when rounded to the nearest thousand?

Back

Round 8,749 to 9,000 and 14,497 to 14,000. The estimated difference is 14,000 - 9,000 = 5,000.

Front

What is the purpose of estimating in math?

Back

Estimating helps to quickly assess the size of numbers and the results of operations without exact calculations.

Front

What is the estimated sum of 4,982 + 981?

Back

The estimated sum is 6,000.