Front

What is place value?

Back

Place value is the value of a digit based on its position in a number. For example, in the number 2,643, the place value of 2 is thousands.

Front

What is the place value of the digit 2 in the number 2,643?

Back

The place value of the digit 2 in the number 2,643 is thousands.

Front

What is the sum of 724 and 275?

Back

The sum of 724 and 275 is 999.

Front

How do you round a number to the nearest ten?

Back

To round a number to the nearest ten, look at the digit in the ones place. If it is 5 or more, round up. If it is less than 5, round down.

Front

Round the number 28 to the nearest ten.

Back

28 rounded to the nearest ten is 30.

Front

What is estimation in math?

Back

Estimation is finding a number that is close enough to the right answer, often by rounding.

Front

Estimate the sum of 81 and 21 by rounding to the nearest ten.

Back

When rounded, 81 becomes 80 and 21 becomes 20. The estimated sum is 100.

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler but still close to the original value.

Front

Round the number 298 to the nearest hundred.

Back

298 rounded to the nearest hundred is 300.

Front

What is the sum of 81 and 21?

Back

The sum of 81 and 21 is 102.