Estimate the total by rounding each number to the nearest ten first, then add.

83 + 46

The sum is about   .

Estimate the total by rounding each number to the nearest ten first, then add.

97 + 76

+ =

Which addition problem has a sum of about 900?

Which addition problem has a sum of about 300?

Which addition problem has a sum of about 150?

Estimate the total by rounding each number to the nearest hundred first, then add.

458 + 391

The sum is about   .

Which addition problem has a sum of about 500?

Which addition problem has a sum of about 90?

Estimate the total by rounding each number to the nearest hundred first, then add.

672 + 248

The sum is about   .

Estimate the total by rounding each number to the nearest hundred first, then add.

348 + 267

+ =

Which addition problem has a sum of about 120?

Estimate the total by rounding each number to the nearest hundred first, then add.

582 + 439

+ =

Which addition problem has a sum of about 700?

Estimate the total by rounding each number to the nearest ten first, then add.

58 + 91

The sum is about   .

Estimate the total by rounding each number to the nearest hundred first, then add.

835 + 164

The sum is about   .

Which addition problem has a sum of about 160?

Estimate the total by rounding each number to the nearest ten first, then add.

64 + 27

The sum is about   .