Rounding, Sums, and Differences

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, usually to the nearest ten, hundred, or other place value.

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 4 or less, round down.

Front

Round 925 to the nearest ten.

Back

930

Front

What is an estimate?

Back

An estimate is a rough calculation or judgment of the value, number, quantity, or extent of something.

Front

Tracy ordered 325 pet toys and 165 bags of dog food. What is the best estimate of the total number of items?

Back

500

Front

Round 459 to the tens place.

Back

460

Front

If you have 382, what is a good estimate of this number?

Back

400

Front

What is the difference between two numbers?

Back

The difference is the result of subtracting one number from another.

Front

What is the sum of two numbers?

Back

The sum is the result of adding two or more numbers together.

Front

Round 642 to the nearest ten, then estimate 642 − 137.

Back

500