Pariksha SaathiQuantitative Aptitude
Approximation: Practice Questions with Answers
14 practice questions on Approximation, with answers; most also have an explanation or a worked solution. Try each one before you open its answer.
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Q.1
41.9% of 599.8 ≈ ?
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Answer: 252
Solution:
- Round: 41.9% → 42%, and 599.8 → 600.
- 42% of 600 = (42/100) × 600 = 252.
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Q.2
28.9² ≈ ?
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Answer: 841
Solution:
- Round 28.9 to the nearest whole number: 29.
- 29² = 841.
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Q.3
√255.8 × 4.02 ≈ ?
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Answer: 64
Solution:
- Round: 255.8 → 256 (a perfect square), and 4.02 → 4.
- √256 = 16, so 16 × 4 = 64.
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Q.4
3599 ÷ 59.8 ≈ ?
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Answer: 60
Solution:
- Round: 3599 → 3600, and 59.8 → 60.
- 3600 ÷ 60 = 60.
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Q.5
12.98 × 7.03 + 25.02 ≈ ?
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Answer: 116
Solution:
- Round: 12.98 → 13, 7.03 → 7, and 25.02 → 25.
- 13 × 7 + 25 = 91 + 25 = 116.
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Q.6
Cube root of 215.5 ≈ ?
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Answer: 6
Solution:
- 215.5 is very close to 216, which is a perfect cube (6³ = 216).
- So the cube root of 215.5 ≈ the cube root of 216 = 6.
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Q.7
20.9 × 30.8 ≈ ?
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Answer: ≈ 651
Solution:
- Round: 20.9 → 21, and 30.8 → 31. Both were rounded UP, so the approximation will come out a little higher than the exact value — fine for a multiple-choice question with options spread apart.
- 21 × 31 = 651 (the exact value, 20.9 × 30.8, works out to 643.72 — close enough to clearly identify the right option).
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Q.8
20.2% of 749.9 ≈ ?
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Q.9
11.2 × 8.9 ≈ ?
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Q.10
6399 ÷ 79.7 ≈ ?
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Q.11
15.92 × 4.08 ≈ ?
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Q.12
49.8 + 30.2 − 19.9 ≈ ?
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Q.13
Cube root of 63.5 ≈ ?
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Q.14
19.1² ≈ ?
How these questions were made
Written by Mahesh Srivastava, Founder of Pariksha Saathi. Published: 2026-10-03.