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Grade 4 - Mathematics
9.11 Estimation: Addition and Subtraction

  1. Approximate the given numbers.
  2. Add or subtract after approximation.
Example: 19,034 + 93
19,034 can be approximated to 19,000
93 can be approximated to 90
19,000 + 90
Answer: 19,090

Example: 4,230 - 167
4,230 can be approximated to 200,000,000
167 can be approximated to 200
200,000,000 - 200
Answer: 199,999,800

Directions: Find the approximate answer using estimation (round up or down before doing the calculation).
Q 1: 17,681 + 66 = _____
20,070
18,000
17,000
18,100

 Q 2: 37,291,510 + 12,999,999 = ________
50,000,000
60,000,000
30,000,000
49,000,000

Q 3: 9,321 + 491 = _____
12,000
13,000
9,000
11,000

 Q 4: 13,590 - 7,821 = _____
20,000
8,000
13,000
6,000

Q 5: 37,291,510 + 12,999,999 = ________
50,000,000
30,000,000
49,000,000
40,000,000

 Q 6: 17,681 + 66 = _____
18,100
17,000
20,070
18,000

Q 7: 9,321 + 491 = _____
9,500
9,000
11,000
13,000

 Q 8: 46,320,490 - 18,999,981 = ___________
37,000,000
45,000,000
28,000,000
40,000,000

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 Question 10: This question is available to subscribers only!


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