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Mathematics MCQs with Answers

Mathematics and quantitative reasoning questions appear in many job and entry tests. Practice arithmetic, algebra, percentages, ratios, averages, profit and loss, and geometry. Attempt timed MCQ tests to improve both your speed and accuracy.

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Q241. How many prime numbers are there between 1 and 20?

  1. 10
  2. 7
  3. 8
  4. 9
Show answer and explanation

Correct answer: C. 8

They are 2, 3, 5, 7, 11, 13, 17, 19.

Q242. Find the perimeter of a rectangle with length 16 cm and breadth 5 cm (in cm).

  1. 80
  2. 37
  3. 21
  4. 42
Show answer and explanation

Correct answer: D. 42

Perimeter = 2(l+b) = 42.

Q243. What is 76 x 64?

  1. 4964
  2. 4894
  3. 4864
  4. 4854
Show answer and explanation

Correct answer: C. 4864

76 x 64 = 4864.

Q244. The marked price of an article is Rs. 2000. After a discount of 15%, what is the selling price in Rs.?

  1. 1700
  2. 1750
  3. 1650
  4. 1985
Show answer and explanation

Correct answer: A. 1700

SP = 2000 x 85/100 = 1700.

Q245. A number 200 is increased by 25%. What is the new number?

  1. 225
  2. 260
  3. 240
  4. 250
Show answer and explanation

Correct answer: D. 250

200 x (100+25)/100 = 250.

Q246. If 2x + 10 = 20, find x.

  1. 7
  2. 6
  3. 4
  4. 5
Show answer and explanation

Correct answer: D. 5

2x = 10, so x = 5.

Q247. Find the total surface area of a cube of side 6 cm (in sq cm).

  1. 36
  2. 108
  3. 216
  4. 144
Show answer and explanation

Correct answer: C. 216

TSA = 6 x side^2 = 216.

Q248. Find the total surface area of a cube of side 8 cm (in sq cm).

  1. 512
  2. 256
  3. 384
  4. 48
Show answer and explanation

Correct answer: C. 384

TSA = 6 x side^2 = 384.

Q249. What is the supplement of 120 degrees?

  1. 70 degrees
  2. 60 degrees
  3. 50 degrees
  4. 30 degrees
Show answer and explanation

Correct answer: B. 60 degrees

Supplementary angles add to 180: 180-120 = 60.

Q250. Find the volume of a cube of side 8 cm (in cubic cm).

  1. 520
  2. 512
  3. 384
  4. 64
Show answer and explanation

Correct answer: B. 512

Volume = side^3 = 512.

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