Estimating Sums

Front

What is estimating sums?

Back

Estimating sums is the process of finding an approximate total by rounding numbers before adding them.

Front

How do you round 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 634 to the nearest ten.

Back

630

Front

Round 128 to the nearest ten.

Back

130

Front

What is the estimated sum of 634 + 128 when rounded to the nearest ten?

Back

760

Front

How do you round to the nearest hundred?

Back

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

Front

Round 186 to the nearest hundred.

Back

200

Front

Round 105 to the nearest hundred.

Back

100

Front

What is the estimated sum of 186 + 105 when rounded to the nearest hundred?

Back

300

Front

Round 363 to the nearest ten.

Back

360