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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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Q451. What is the HCF of 12 and 18?

  1. 8
  2. 12
  3. 7
  4. 6
Show answer and explanation

Correct answer: D. 6

The greatest common divisor of 12 and 18 is 6.

Q452. A father is 39 years old and his son is 5. What will be the sum of their ages after 4 years?

  1. 52
  2. 44
  3. 56
  4. 48
Show answer and explanation

Correct answer: A. 52

Sum now = 44; after 4 years add 2x4.

Q453. How many degrees are in a right angle?

  1. 180
  2. 90
  3. 45
  4. 60
Show answer and explanation

Correct answer: B. 90

A right angle is 90 degrees.

Q454. If 10% of a number is 100, what is the number?

  1. 980
  2. 2000
  3. 1020
  4. 1000
Show answer and explanation

Correct answer: D. 1000

Number = 100 x 100/10 = 1000.

Q455. What is the HCF of 20 and 8?

  1. 5
  2. 6
  3. 8
  4. 4
Show answer and explanation

Correct answer: D. 4

The greatest common divisor of 20 and 8 is 4.

Q456. If 3x + 18 = 36, find x.

  1. 7
  2. 8
  3. 5
  4. 6
Show answer and explanation

Correct answer: D. 6

3x = 18, so x = 6.

Q457. 20 is what percent of 20?

  1. 95%
  2. 105%
  3. 100%
  4. 200%
Show answer and explanation

Correct answer: C. 100%

(20/20) x 100 = 100%.

Q458. Find the total surface area of a cube of side 3 cm (in sq cm).

  1. 18
  2. 36
  3. 27
  4. 54
Show answer and explanation

Correct answer: D. 54

TSA = 6 x side^2 = 54.

Q459. What is the LCM of 12 and 30?

  1. 120
  2. 54
  3. 60
  4. 66
Show answer and explanation

Correct answer: C. 60

LCM = (x*y)/HCF = 360/6 = 60.

Q460. Find the roots of x^2 - 13x + 36 = 0.

  1. -4 and -9
  2. 5 and 9
  3. 4 and 10
  4. 4 and 9
Show answer and explanation

Correct answer: D. 4 and 9

The equation factors as (x-4)(x-9) = 0.

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