Rounding Numbers to Estimate the Sum Flashcard

Front

What is the rhyme Mr. Will uses to round numbers?

Back

Five or greater, add one more; Four or below, let it go.

Front

What is rounding in mathematics?

Back

Rounding is the process of adjusting the digits of a number to make it simpler and easier to work with, while keeping its value close to what it was.

Front

When rounding to the nearest ten, what digit do you look at?

Back

You look at the ones digit.

Front

What happens if the ones digit is 5 or greater when rounding to the nearest ten?

Back

You round up to the next ten.

Front

What happens if the ones digit is 4 or below when rounding to the nearest ten?

Back

You round down to the previous ten.

Front

What is the sum of 2 and 9?

Back

11.

Front

What is the sum of 7 and 1?

Back

8.

Front

What is the sum of 3 and 5?

Back

8.

Front

When rounding 52 to the nearest ten, what is the rounded number?

Back

50.

Front

How do you estimate the sum of 48 and 27 using rounding?

Back

Round 48 to 50 and 27 to 30, then add: 50 + 30 = 80.