Addition- Estimate

Front

What does it mean to estimate a sum?

Back

Estimating a sum means finding a rough value of the total by rounding the numbers to the largest place value before adding them.

Front

How do you round a number to the nearest hundred?

Back

To round a number to the nearest hundred, look at the tens digit. If it is 5 or more, round up. If it is 4 or less, round down.

Front

What is the largest place value in the number 345?

Back

The largest place value in the number 345 is the hundreds place, which is 3.

Front

Estimate the sum of 245 and 67 by rounding to the largest place value.

Back

Estimate: 300 (rounded from 245 to 300 and 67 to 0).

Front

Estimate the sum of 82 and 39 by rounding to the largest place value.

Back

Estimate: 120 (rounded from 82 to 80 and 39 to 40).

Front

What is the largest place value in the number 89?

Back

The largest place value in the number 89 is the tens place, which is 8.

Front

Estimate the sum of 56 and 34 by rounding to the largest place value.

Back

Estimate: 90 (rounded from 56 to 60 and 34 to 30).

Front

What is the largest place value in the number 150?

Back

The largest place value in the number 150 is the hundreds place, which is 1.

Front

Estimate the sum of 120 and 30 by rounding to the largest place value.

Back

Estimate: 150 (rounded from 120 to 100 and 30 to 0).

Front

What is the largest place value in the number 70?

Back

The largest place value in the number 70 is the tens place, which is 7.