Estimating Sums and Differences

Front

What is estimating in math?

Back

Estimating is finding a number that is close enough to the right answer, often used to make calculations easier.

Front

How do you estimate a sum?

Back

To estimate a sum, round each number to the nearest ten and then add those rounded numbers.

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

Front

How do you estimate a difference?

Back

To estimate a difference, round each number to the nearest ten and then subtract the smaller rounded number from the larger one.

Front

Estimate the sum: 45 + 36 to the nearest 10.

Back

80

Front

Estimate the difference: 92 - 47 to the nearest 10.

Back

50

Front

What is the nearest ten of 89?

Back

90

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What is the nearest ten of 31?

Back

30

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Estimate the sum: 67 + 24 to the nearest 10.

Back

90

Front

Estimate the difference: 75 - 28 to the nearest 10.

Back

50

Front

What is the nearest ten of 63?

Back

60

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3