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DSSSB TGT / PGT · Reasoning

Mathematical Operations Previous Year Questions

10 Mathematical Operations (Reasoning) questions asked in DSSSB TGT / PGT previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.

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Attempt DSSSB TGT / PGT papers →All Reasoning questions

Other Reasoning topics

Alphabet & Number Series 35Direction Sense 14Blood Relations 13Coding-Decoding 13Syllogism 12Classification 10Order & Ranking 10Seating Arrangement 9Statement & Arguments 8
Q1From DSSSB TGT Computer Science Full Mock Test 5
If '÷' means '+', '−' means '×', '×' means '÷' and '+' means '−', then 20 × 4 − 3 ÷ 7 + 5 = ?
  1. A17
  2. B15
  3. C21
  4. D19
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Correct answer: (A) 17

Explanation

20 ÷ 4 × 3 + 7 − 5 = 15 + 7 − 5 = 17.

Q2From DSSSB TGT Computer Science Full Mock Test 4
If '×' means '+', '÷' means '−', '+' means '×' and '−' means '÷', then 6 × 4 ÷ 8 + 2 − 4 = ?
  1. A8
  2. B6
  3. C4
  4. D10
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Correct answer: (B) 6

Explanation

6 + 4 − 8 × 2 ÷ 4 = 6 + 4 − 4 = 6.

Q3From DSSSB TGT Computer Science Full Mock Test 2
If '+' means '−', '−' means '×', '×' means '÷' and '÷' means '+', then 12 ÷ 6 − 2 × 4 + 3 = ?
  1. A12
  2. B15
  3. C18
  4. D9
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Correct answer: (A) 12

Explanation

12 + 6 × 2 ÷ 4 − 3 = 12 + 3 − 3 = 12.

Q4From DSSSB TGT Computer Science Full Mock Test 1
If '+' means '×', '−' means '÷', '×' means '+' and '÷' means '−', then the value of 8 + 4 − 2 × 6 ÷ 3 is:
  1. A13
  2. B21
  3. C19
  4. D17
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Correct answer: (C) 19

Explanation

8 × 4 ÷ 2 + 6 − 3 = 16 + 6 − 3 = 19.

Q5DSSSB TGT Computer Science, 25 Jun 2023, Shift 1 (8:30 AM)
Which two signs should be interchanged to make the following equation correct? 105 ÷ 21 + 67 − 64 × 16 = 287
  1. A÷ and ×
  2. B× and +
  3. C+ and −
  4. D× and −
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Correct answer: (B) × and +

Explanation

Swap × and +: 105 ÷ 21 × 67 − 64 + 16 = 5 × 67 − 64 + 16 = 335 − 64 + 16 = 287.

Q6DSSSB TGT Computer Science, 24 Jun 2023, Shift 3 (4:30 PM)
Which two signs should be interchanged to make the following equation correct? 234 ÷ 18 + 47 − 14 × 18 = 653
  1. A+ and −
  2. B÷ and ×
  3. C× and −
  4. D÷ and +
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Correct answer: (C) × and −

Explanation

Interchanging × and − gives 234 ÷ 18 + 47 × 14 − 18 = 13 + 658 − 18 = 653, so the equation balances.

Q7DSSSB TGT Computer Science, 7 Feb 2024, Shift 2 (12:30 PM)
If ‘÷’ means ‘×’, ‘–’ means ‘+’, ‘×’ means ‘÷’ and ‘+’ means ‘–’, then 38 × 57 ÷ 9 – 18 + 12 = ?
  1. A10
  2. B12
  3. C6
  4. D7
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Correct answer: (B) 12

Explanation

After swapping the signs the expression becomes 38 ÷ 57 × 9 + 18 − 12. 38/57 × 9 = 6, then 6 + 18 − 12 = 12.

Q8DSSSB TGT Computer Science, 25 Jun 2023, Shift 3 (4:30 PM)
If '+' means 'division', '×' means 'subtraction', '÷' means 'addition' and '−' means 'multiplication', then find the value of the following expression. 35 + 7 − 8 ÷ 25 × 2
  1. A55
  2. B63
  3. C50
  4. D62
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Correct answer: (B) 63

Explanation

After replacing the signs the expression is 35 ÷ 7 × 8 + 25 − 2 = 5 × 8 + 25 − 2 = 40 + 23 = 63.

Q9DSSSB TGT Computer Science, 25 Jun 2023, Shift 3 (4:30 PM)
Which two numbers should be interchanged to make the following equation correct? 40 + 20 × 65 ÷ 13 − 18 = 110
  1. A13 and 18
  2. B20 and 18
  3. C20 and 13
  4. D40 and 13
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Correct answer: (B) 20 and 18

Explanation

After swapping 20 and 18: 40 + 18 × 65 ÷ 13 − 20 = 40 + 18 × 5 − 20 = 40 + 90 − 20 = 110.

Q10DSSSB TGT Computer Science, 25 Jun 2023, Shift 2 (12:30 PM)
Which two signs should be interchanged to make the following equation correct? 56 − 74 × 17 + 391 ÷ 23 = 1297
  1. A÷ and ×
  2. B+ and −
  3. C× and −
  4. D÷ and +
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Correct answer: (B) + and −

Explanation

After swapping + and −: 56 + 74 × 17 − 391 ÷ 23 = 56 + 1258 − 17 = 1297, which balances.

How to use these DSSSB TGT / PGT Reasoning questions

Every question here was asked in a real DSSSB TGT / PGT paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full DSSSB TGT / PGT papers as timed tests to check your speed under exam conditions.

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