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

 Q 2: 46,320,490 - 18,999,981 = ___________
40,000,000
45,000,000
37,000,000
28,000,000

Q 3: 1,651 - 1,148 = ____
600
500
800
1,000

 Q 4: 11,341,280 + 978 = ________
12,000,000
10,900,000
11,000,000
10,001,000

Q 5: 37,328 - 649 = _____
37,300
36,000
30,000
38,000

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

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