Rounding and Estimating Sums Flashcard

Front

What does it mean to round a number?

Back

Rounding a number means adjusting it to the nearest ten, hundred, or other place value to make it easier to work with.

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 34 to the nearest ten.

Back

30

Front

Round 65 to the nearest ten.

Back

70

Front

Round 194 to the nearest ten.

Back

190

Front

Round 7 to the nearest ten.

Back

10

Front

What is estimating a sum?

Back

Estimating a sum means finding a rough answer by rounding the numbers before adding them.

Front

Estimate the sum: 456 + 823.

Back

500 + 800 = 1,300

Front

What is the nearest ten to 34?

Back

30

Front

What is the nearest ten to 65?

Back

70