Estimating & Rounding

Front

What is rounding?

Back

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

Front

What is the nearest ten to 39?

Back

40

Front

What is the nearest ten to 56?

Back

60

Front

What is estimating?

Back

Estimating is finding a number that is close enough to the right answer for quick calculations.

Front

How do you estimate the sum of 77 and 12?

Back

Round 77 to 80 and 12 to 10, then add: 80 + 10 = 90.

Front

How do you estimate the sum of 66 and 22?

Back

Round 66 to 70 and 22 to 20, then add: 70 + 20 = 90.

Front

What is the sum of 38 and 17 when estimated?

Back

Round 38 to 40 and 17 to 20, then add: 40 + 20 = 60.

Front

What is the purpose of rounding numbers?

Back

Rounding makes it easier to add, subtract, or compare numbers.

Front

What is the nearest ten to 45?

Back

50

Front

What is the nearest ten to 32?

Back

30