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ISRO Scientist Simplification & Approximation Questions with Answers & Explanations

17 Simplification & Approximation questions from the Quantitative Aptitude section of ISRO Scientist, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

Simplify: 95 + 10 × 2 − 88 ÷ 8

  1. A126
  2. B199
  3. C104
  4. D114
Show answer
Answer: (C) 104 By BODMAS: 10 × 2 = 20, 88 ÷ 8 = 11; 95 + 20 − 11 = 104.
Question 2

Simplify: 77 + 11 × 4 − 32 ÷ 4

  1. A129
  2. B113
  3. C123
  4. D109
Show answer
Answer: (B) 113 By BODMAS: 11 × 4 = 44, 32 ÷ 4 = 8; 77 + 44 − 8 = 113.
Question 3

Simplify: 55 + 13 × 6 − 8 ÷ 4

  1. A131
  2. B406
  3. C127
  4. D141
Show answer
Answer: (A) 131 By BODMAS: 13 × 6 = 78, 8 ÷ 4 = 2; 55 + 78 − 2 = 131.
Question 4

Simplify: 68 + 10 × 9 − 18 ÷ 6

  1. A165
  2. B161
  3. C155
  4. D699
Show answer
Answer: (C) 155 By BODMAS: 10 × 9 = 90, 18 ÷ 6 = 3; 68 + 90 − 3 = 155.
Question 5

Simplify: 31 + 7 × 6 − 24 ÷ 4

  1. A77
  2. B67
  3. C222
  4. D79
Show answer
Answer: (B) 67 By BODMAS: 7 × 6 = 42, 24 ÷ 4 = 6; 31 + 42 − 6 = 67.
Question 6

Simplify: 27 + 7 × 4 − 66 ÷ 6

  1. A40
  2. B66
  3. C54
  4. D44
Show answer
Answer: (D) 44 By BODMAS: 7 × 4 = 28, 66 ÷ 6 = 11; 27 + 28 − 11 = 44.
Question 7

Simplify: 94 + 14 × 9 − 56 ÷ 8

  1. A223
  2. B965
  3. C213
  4. D227
Show answer
Answer: (C) 213 By BODMAS: 14 × 9 = 126, 56 ÷ 8 = 7; 94 + 126 − 7 = 213.
Question 8

Simplify: 88 + 11 × 4 − 63 ÷ 7

  1. A123
  2. B119
  3. C141
  4. D133
Show answer
Answer: (A) 123 By BODMAS: 11 × 4 = 44, 63 ÷ 7 = 9; 88 + 44 − 9 = 123.
Question 9

Simplify: 89 + 5 × 2 − 16 ÷ 4

  1. A103
  2. B184
  3. C95
  4. D105
Show answer
Answer: (C) 95 By BODMAS: 5 × 2 = 10, 16 ÷ 4 = 4; 89 + 10 − 4 = 95.
Question 10

Simplify: 50 + 4 × 7 − 45 ÷ 9

  1. A69
  2. B83
  3. C73
  4. D373
Show answer
Answer: (C) 73 By BODMAS: 4 × 7 = 28, 45 ÷ 9 = 5; 50 + 28 − 5 = 73.

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Question 11

Simplify: 92 + 3 × 3 − 49 ÷ 7

  1. A108
  2. B278
  3. C104
  4. D94
Show answer
Answer: (D) 94 By BODMAS: 3 × 3 = 9, 49 ÷ 7 = 7; 92 + 9 − 7 = 94.
Question 12

Simplify: 89 + 11 × 5 − 32 ÷ 8

  1. A136
  2. B140
  3. C150
  4. D148
Show answer
Answer: (B) 140 By BODMAS: 11 × 5 = 55, 32 ÷ 8 = 4; 89 + 55 − 4 = 140.
Question 13

Simplify: 70 + 14 × 5 − 108 ÷ 9

  1. A138
  2. B128
  3. C124
  4. D152
Show answer
Answer: (B) 128 By BODMAS: 14 × 5 = 70, 108 ÷ 9 = 12; 70 + 70 − 12 = 128.
Question 14

Simplify: 71 + 8 × 5 − 60 ÷ 5

  1. A99
  2. B123
  3. C109
  4. D383
Show answer
Answer: (A) 99 By BODMAS: 8 × 5 = 40, 60 ÷ 5 = 12; 71 + 40 − 12 = 99.
Question 15

Simplify: 91 + 3 × 8 − 88 ÷ 8

  1. A126
  2. B741
  3. C100
  4. D104
Show answer
Answer: (D) 104 By BODMAS: 3 × 8 = 24, 88 ÷ 8 = 11; 91 + 24 − 11 = 104.
Question 16

Simplify: 75 + 4 × 6 − 16 ÷ 4

  1. A95
  2. B103
  3. C91
  4. D470
Show answer
Answer: (A) 95 By BODMAS: 4 × 6 = 24, 16 ÷ 4 = 4; 75 + 24 − 4 = 95.
Question 17

Simplify: 59 + 5 × 2 − 44 ÷ 4

  1. A58
  2. B54
  3. C117
  4. D80
Show answer
Answer: (A) 58 By BODMAS: 5 × 2 = 10, 44 ÷ 4 = 11; 59 + 10 − 11 = 58.

These are RankerClub practice questions written in the ISRO Scientist pattern. They are not official SSC/IBPS/RRB papers.

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