ComputePrep Timed quant & vedic drills

Fast calculation questions with answers

Speed in a quantitative section comes from the arithmetic between the steps, not from the method. These fast calculation questions drill exactly that layer — the multiplications, splits and complements a candidate should never write down. Every walkthrough shows the mental route in the order a solver would actually think it.

Download the PDF — 15 questions with answers

Free, ungated, no email. This is the fast calculation tricks with answers PDF — the same 15 questions as below, with every worked solution at the back, ready to print.

How to use this set

The 15 questions below are ordered the way an exam block is rather than easiest-first: two gentle openers, then a run of medium, and a hard one every sixth question — 2 of the 15 sit in the hard band. Every question is a speed arithmetic.

Work each question on paper before you open its solution. The walkthrough is the method itself, step for step, so reading it first turns a practice set into a reading exercise and teaches nothing. If you are stuck on the method rather than on one question, the method guide is a better place to start than the next question: Fast calculation: the mental route.

15 fast calculation questions with answers

Every question below was generated by the same engine that mints the ComputePrep daily timed drill, and machine-checked before it reached this page — a multiple-choice question validates its own answer against its own options at generation, and ships only with a walkthrough attached. The walkthrough is the engine's own.

Question 1

Solve in your head — beat the clock.

7 × 9 = ?

  1. 70
  2. 67
  3. 63
  4. 73
  5. 72
Show the worked solution
  1. Compute directly: 7 × 9 = 63.

Question 2

Solve in your head — beat the clock.

10 × 6 = ?

  1. 69
  2. 62
  3. 66
  4. 60
  5. 70
Show the worked solution
  1. Compute directly: 10 × 6 = 60.

Question 3

Solve in your head — beat the clock.

184 + 476 = ?

  1. 650
  2. 660
  3. 661
  4. 670
  5. 726
Show the worked solution
  1. Compute directly: 184 + 476 = 660.

Question 4

Solve in your head — beat the clock.

779 − 381 = ?

  1. 498
  2. 398
  3. 408
  4. 407
  5. 399
Show the worked solution
  1. Compute directly: 779 − 381 = 398.

Question 5

Solve in your head — beat the clock.

564 − 373 = ?

  1. 291
  2. 192
  3. 199
  4. 201
  5. 191
Show the worked solution
  1. Compute directly: 564 − 373 = 191.

Question 6

Solve in your head — beat the clock.

3878 + 121 = ?

  1. 3989
  2. 3998
  3. 4000
  4. 3999
  5. 4009
Show the worked solution
  1. Compute directly: 3878 + 121 = 3999.

Question 7

Solve in your head — beat the clock.

10 × 6 = ?

  1. 66
  2. 54
  3. 50
  4. 60
  5. 56
Show the worked solution
  1. Compute directly: 10 × 6 = 60.

Question 8

Solve in your head — beat the clock.

15 + 74 = ?

  1. 90
  2. 89
  3. 99
  4. 79
  5. 98
Show the worked solution
  1. Compute directly: 15 + 74 = 89.

Question 9

Solve in your head — beat the clock.

460 ÷ 5 = ?

  1. 93
  2. 94
  3. 90
  4. 91
  5. 92
Show the worked solution
  1. Think multiplication: 5 × ? = 460. Since 5 × 92 = 460, the answer is 92.

Question 10

Solve in your head — beat the clock.

234 + 153 = ?

  1. 397
  2. 426
  3. 387
  4. 377
  5. 388
Show the worked solution
  1. Compute directly: 234 + 153 = 387.

Question 11

Solve in your head — beat the clock.

86 × 9 = ?

  1. 765
  2. 860
  3. 783
  4. 688
  5. 774
Show the worked solution
  1. Compute directly: 86 × 9 = 774.

Question 12

Solve in your head — beat the clock.

9701 − 1608 = ?

  1. 8093
  2. 8103
  3. 8092
  4. 8083
  5. 8094
Show the worked solution
  1. Compute directly: 9701 − 1608 = 8093.

Question 13

Solve in your head — beat the clock.

12 × 6 = ?

  1. 78
  2. 72
  3. 60
  4. 66
  5. 62
Show the worked solution
  1. Compute directly: 12 × 6 = 72.

Question 14

Solve in your head — beat the clock.

7 × 6 = ?

  1. 48
  2. 52
  3. 42
  4. 36
  5. 49
Show the worked solution
  1. Compute directly: 7 × 6 = 42.

Question 15

Solve in your head — beat the clock.

679 ÷ 7 = ?

  1. 97
  2. 107
  3. 98
  4. 103
  5. 99
Show the worked solution
  1. Think multiplication: 7 × ? = 679. Since 7 × 97 = 679, the answer is 97.
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Where these questions come from

Most free practice for this topic is a scanned upload or a blog quiz, and neither can tell you a question has exactly one answer. That is the one thing this set can promise: it is minted, not typed. The engine behind it serves ComputePrep's daily timed drill, so the questions here are the same shape as the ones a live round would give you — and there is an unlimited supply of them, which is why this page can be regenerated rather than padded.

If you want the method rather than more questions, Fast calculation: the mental route covers the approach, the traps and a worked table. This page and that one deliberately answer different questions: that one is how do I solve these, this one is give me fast calculation questions with the answers.

FAQ

How much arithmetic should I be doing in my head?

Every two-digit multiplication, every percentage of a round number, and every fraction from the standard table. Writing those down costs five to eight seconds each; across a thirty-five question section that is several minutes, which is the difference between attempting the last set and not.

What is the single highest-return drill?

Tables to twenty, squares to thirty, and cubes to twenty, to instant recall. Everything else in the quantitative section sits on top of those, and no technique compensates for having to reconstruct 17 × 14 in the middle of a data interpretation set.

Is approximation risky in an exam?

Only when the options are close. Check the option spread first: if they differ by more than a few per cent, round aggressively and pick the nearest. If two options sit within one per cent of each other, the question is asking for the exact value and you should compute it.

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