Simplification & Approximation

LSSSSB Non-Technical · Mathematics · 100 practice questions with answers and explanations: 67 Easy, 33 Medium, 0 Hard.

Sample questions

Sample Easy question 1

Simplify: √5 × √20

  1. 11
  2. 10
  3. 8
  4. 9
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Answer: B. √5 × √20 = √(5×20) = √100 = 10.

Sample Easy question 2

Simplify: [(50-20)/5 + 6] × 2

  1. 20
  2. 26
  3. 22
  4. 24
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Answer: D. (30/5 + 6) × 2 = (6+6) × 2 = 24.

Sample Easy question 3

Simplify: 3 × [25 - {15 - (8-4)}]

  1. 45
  2. 36
  3. 39
  4. 42
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Answer: D. 8-4=4; 15-4=11; 25-11=14; 3×14=42.

Sample Medium question 4

Simplify: 5/6 - 1/3 + 1/2

  1. 0.5
  2. 1.25
  3. 0.75
  4. 1
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Answer: D. LCD 6: 5/6 - 2/6 + 3/6 = 6/6 = 1.

Sample Medium question 5

Find the approximate value of 15.98 × 4.02.

  1. 60
  2. 66
  3. 62
  4. 64
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Answer: D. Approximating: 16 × 4 = 64.

Sample Medium question 6

Simplify: 2/3 + 3/4 - 1/6

  1. 1.5
  2. 1.1
  3. 1
  4. 1.25
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Answer: D. LCD 12: 8/12 + 9/12 - 2/12 = 15/12 = 1.25.

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