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RRB NTPC Simplification & Approximation Questions with Answers & Explanations

18 Simplification & Approximation questions from the Mathematics section of RRB NTPC, 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: 39 + 5 × 7 − 54 ÷ 6

  1. A61
  2. B299
  3. C65
  4. D83
Show answer
Answer: (C) 65 By BODMAS: 5 × 7 = 35, 54 ÷ 6 = 9; 39 + 35 − 9 = 65.
Question 2

Simplify: 67 + 9 × 8 − 24 ÷ 8

  1. A132
  2. B142
  3. C605
  4. D136
Show answer
Answer: (D) 136 By BODMAS: 9 × 8 = 72, 24 ÷ 8 = 3; 67 + 72 − 3 = 136.
Question 3

Simplify: 96 + 13 × 5 − 20 ÷ 4

  1. A540
  2. B156
  3. C166
  4. D152
Show answer
Answer: (B) 156 By BODMAS: 13 × 5 = 65, 20 ÷ 4 = 5; 96 + 65 − 5 = 156.
Question 4

Simplify: 23 + 11 × 8 − 99 ÷ 9

  1. A96
  2. B122
  3. C261
  4. D100
Show answer
Answer: (D) 100 By BODMAS: 11 × 8 = 88, 99 ÷ 9 = 11; 23 + 88 − 11 = 100.
Question 5

Simplify: 28 + 10 × 2 − 10 ÷ 5

  1. A50
  2. B74
  3. C46
  4. D42
Show answer
Answer: (C) 46 By BODMAS: 10 × 2 = 20, 10 ÷ 5 = 2; 28 + 20 − 2 = 46.
Question 6

Simplify: 11 + 9 × 3 − 84 ÷ 7

  1. A48
  2. B36
  3. C50
  4. D26
Show answer
Answer: (D) 26 By BODMAS: 9 × 3 = 27, 84 ÷ 7 = 12; 11 + 27 − 12 = 26.
Question 7

Simplify: 16 + 6 × 8 − 40 ÷ 4

  1. A74
  2. B50
  3. C54
  4. D64
Show answer
Answer: (C) 54 By BODMAS: 6 × 8 = 48, 40 ÷ 4 = 10; 16 + 48 − 10 = 54.
Question 8

Simplify: 19 + 7 × 9 − 27 ÷ 3

  1. A225
  2. B91
  3. C73
  4. D69
Show answer
Answer: (C) 73 By BODMAS: 7 × 9 = 63, 27 ÷ 3 = 9; 19 + 63 − 9 = 73.
Question 9

Simplify: 74 + 12 × 6 − 24 ÷ 8

  1. A149
  2. B143
  3. C513
  4. D153
Show answer
Answer: (B) 143 By BODMAS: 12 × 6 = 72, 24 ÷ 8 = 3; 74 + 72 − 3 = 143.
Question 10

Simplify: 98 + 9 × 4 − 54 ÷ 6

  1. A419
  2. B143
  3. C125
  4. D121
Show answer
Answer: (C) 125 By BODMAS: 9 × 4 = 36, 54 ÷ 6 = 9; 98 + 36 − 9 = 125.

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Question 11

Simplify: 92 + 13 × 9 − 18 ÷ 3

  1. A203
  2. B215
  3. C199
  4. D939
Show answer
Answer: (A) 203 By BODMAS: 13 × 9 = 117, 18 ÷ 3 = 6; 92 + 117 − 6 = 203.
Question 12

Simplify: 66 + 6 × 9 − 60 ÷ 6

  1. A130
  2. B106
  3. C638
  4. D110
Show answer
Answer: (D) 110 By BODMAS: 6 × 9 = 54, 60 ÷ 6 = 10; 66 + 54 − 10 = 110.
Question 13

Simplify: 93 + 10 × 6 − 14 ÷ 7

  1. A161
  2. B616
  3. C151
  4. D147
Show answer
Answer: (C) 151 By BODMAS: 10 × 6 = 60, 14 ÷ 7 = 2; 93 + 60 − 2 = 151.
Question 14

Simplify: 13 + 4 × 9 − 54 ÷ 9

  1. A43
  2. B55
  3. C53
  4. D39
Show answer
Answer: (A) 43 By BODMAS: 4 × 9 = 36, 54 ÷ 9 = 6; 13 + 36 − 6 = 43.
Question 15

Simplify: 15 + 12 × 2 − 6 ÷ 2

  1. A46
  2. B36
  3. C42
  4. D32
Show answer
Answer: (B) 36 By BODMAS: 12 × 2 = 24, 6 ÷ 2 = 3; 15 + 24 − 3 = 36.
Question 16

Simplify: 16 + 3 × 5 − 96 ÷ 8

  1. A83
  2. B19
  3. C43
  4. D29
Show answer
Answer: (B) 19 By BODMAS: 3 × 5 = 15, 96 ÷ 8 = 12; 16 + 15 − 12 = 19.
Question 17

Simplify: 28 + 12 × 9 − 72 ÷ 8

  1. A351
  2. B137
  3. C123
  4. D127
Show answer
Answer: (D) 127 By BODMAS: 12 × 9 = 108, 72 ÷ 8 = 9; 28 + 108 − 9 = 127.
Question 18

Simplify: 23 + 15 × 4 − 49 ÷ 7

  1. A145
  2. B90
  3. C76
  4. D86
Show answer
Answer: (C) 76 By BODMAS: 15 × 4 = 60, 49 ÷ 7 = 7; 23 + 60 − 7 = 76.

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