Estimating Sums Worksheet
Practice estimating sums of whole numbers for Grade 4 math students.
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Estimating Sums
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Read each question carefully and follow the instructions. Remember to round the numbers before estimating the sum.
Round each number to the nearest ten, then estimate the sum.
1. 32 + 47 ≈ + =
2. 68 + 21 ≈ + =
3. 55 + 39 ≈ + =
Round each number to the nearest hundred, then estimate the sum.
1. 123 + 389 ≈ + =
2. 456 + 210 ≈ + =
3. 789 + 112 ≈ + =
Match each problem with its estimated sum (rounded to the nearest hundred).
1. 287 + 415
a. 700
2. 109 + 590
b. 900
3. 678 + 221
c. 800
A baker made 175 cookies on Monday and 230 cookies on Tuesday. Estimate the total number of cookies made over the two days by rounding each number to the nearest hundred.
1. Which is the best estimate for the sum of 412 + 378 when rounding to the nearest ten?
780
790
800
700
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