Estimate Sums

Front

What is estimating sums?

Back

Estimating sums means finding a close value to the actual sum by rounding numbers before adding them.

Front

How do you round a number to the nearest ten?

Back

Look at the digit in the ones place. If it's 5 or more, round up. If it's 4 or less, round down.

Front

Round 123 to the nearest ten.

Back

120

Front

Round 12 to the nearest ten.

Back

10

Front

What is the estimated sum of 123 and 12 when rounded to the nearest ten?

Back

130

Front

What is 138 rounded to the nearest ten?

Back

140

Front

Round 31 to the nearest ten.

Back

30

Front

Round 19 to the nearest ten.

Back

20

Front

What is the estimated sum of 31 and 19 when rounded to the nearest ten?

Back

50

Front

What is 26 rounded to the nearest ten?

Back

30