# Lesson Worksheet: Estimating Sums of Two-Digit Numbers: Rounding Mathematics • 3rd Grade

In this worksheet, we will practice estimating the sum of two-digit numbers by rounding to the nearest ten.

Q1:

Which number is nearest to ?

• A30
• B50
• C40
• D80

Q2:

Choose the number that is closest to .

• A300
• B100
• C200

Q3:

Estimate by rounding the numbers to the nearest tens.

Q4:

Daniel and Ethan are picking apples from an apple tree. If Daniel picks 24 apples and Ethan picks 18 apples, estimate the number of apples they both have by rounding the numbers to the nearest ten.

Q5:

Estimate 27 + 14 by rounding each number to the nearest ten.

Q6:

Estimate by rounding the two numbers to the nearest ten using the number line.

Q7:

Estimate by rounding the two numbers to the nearest ten using the number line.

Q8:

Estimate the sum of by rounding the two numbers to the nearest ten using the number line.

Q9:

Estimate the sum by rounding each number to the nearest ten:

Q10:

Estimate by rounding the numbers to the nearest tens.

Q11:

Michael bought two books. One cost him \$24, and the other cost him \$11. Estimate how much he paid for the two books by rounding each price to the nearest ten.

Q12:

Fill in the gap: . Use , , or .

• A
• B
• C

Q13:

Use , , or to fill in the gap: .

• A
• B
• C

Q14:

Which number fits in the gap? .