Estimation of Sums and Differences by Rounding Off Data, Fourth Grade Math Test

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This online and absolutely free math test is aimed at fourth grade students of maths. In this test, students are required to perform summation or subtraction of given numbers to an approximate value by rounding off the numbers and performing addition or subtraction.
Problem #1
Estimate the sum by rounding each number to the nearest ten and then adding.
19 + 121 = ?
Answer:
Problem #2
Estimate the sum by rounding each number to the nearest ten and then subtracting.
76 - 57 = ?
Answer:
Problem #3
Estimate the sum by rounding each number to the nearest ten and then adding.
41 + 94 = ?
Answer:
Problem #4
Estimate the sum by rounding each number to the nearest ten and then subtracting.
82 - 18 = ?
Answer:
Problem #5
Estimate the sum by rounding each number to the nearest ten and then adding.
139 + 17 = ?
Answer:
Problem #6
Estimate the sum by rounding each number to the nearest hundred and then adding.
1458 + 2480 = ?
Answer:
Problem #7
Estimate the sum by rounding each number to the nearest hundred and then subtracting.
3243 - 1243 = ?
Answer:
Problem #8
Estimate the sum by rounding each number to the nearest hundred and then adding.
2918 + 1125 = ?
Answer:
Problem #9
Estimate the sum by rounding each number to the nearest hundred and then adding.
3644 + 3475 = ?
Answer:
Problem #10
Estimate the sum by rounding each number to the nearest hundred and then subtracting.
4829 - 2429 = ?
Answer:
Problem #11
Estimate the sum by rounding each number to the nearest thousand and then adding.
4820 + 1965 = ?
Answer:
Problem #12
Estimate the sum by rounding each number to the nearest thousand and then adding.
2385 + 12672 = ?
Answer:
Problem #13
Estimate the sum by rounding each number to the nearest thousand and then adding.
3585 + 1996 = ?
Answer:
Problem #14
Estimate the sum by rounding each number to the nearest thousand and then subtracting.
35248 - 5149 = ?
Answer:



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