Simplification & Approximation

SSC CGL · Quantitative Aptitude · 100 practice questions with answers and explanations: 36 Easy, 30 Medium, 34 Hard.

Sample questions

Sample Easy question 1

Simplify: 80 - 45 ÷ 9 + 12

  1. 83
  2. 85
  3. 87
  4. 89
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Answer: C. By BODMAS: 80 - 5 + 12 = 87.

Sample Medium question 2

Simplify: 2½ + 3⅓

  1. 5⅓
  2. 5½
  3. 5⅔
  4. 5⅚
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Answer: D. 2½ + 3⅓ = 5/2 + 10/3 = 15/6 + 20/6 = 35/6 = 5⅚.

Sample Hard question 3

Using the identity a²-b² = (a+b)(a-b), simplify 68² - 32².

  1. 3400
  2. 3500
  3. 3600
  4. 3700
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Answer: C. (68+32)(68-32) = 100 × 36 = 3600.

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