Rounding and Estimating

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

What does it mean to estimate?

Back

Estimating means making an educated guess about a number or quantity, often by rounding.

Front

How do you round a number to the nearest ten?

Back

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 314 to the nearest ten.

Back

310

Front

Round 168 to the nearest ten.

Back

170

Front

What is the best way to estimate the difference between two numbers?

Back

Round each number to the nearest ten and then subtract.

Front

Estimate the difference between 314 and 168 by rounding.

Back

310 - 170 = 140

Front

How do you find the total of two numbers?

Back

Add the two numbers together.

Front

Estimate the total of 85 and 102 by rounding to the nearest ten.

Back

90 + 100 = 190

Front

Round 95 to the nearest ten.

Back

100