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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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Q121. What is the average of 21, 38, 22, 17, 47?

  1. 31
  2. 29
  3. 28
  4. 30
Show answer and explanation

Correct answer: B. 29

Sum = 145; average = 145/5 = 29.

Q122. What is the sum of angles of a triangle?

  1. 270 degrees
  2. 90 degrees
  3. 180 degrees
  4. 360 degrees
Show answer and explanation

Correct answer: C. 180 degrees

The three interior angles sum to 180.

Q123. What is 5.5 + 5.5?

  1. 12.0
  2. 10.9
  3. 11.0
  4. 11.1
Show answer and explanation

Correct answer: C. 11.0

5.5 + 5.5 = 11.0.

Q124. What is the area of a square of side 5 cm (in sq cm)?

  1. 20
  2. 25
  3. 30
  4. 50
Show answer and explanation

Correct answer: B. 25

Area = side^2 = 25.

Q125. Find the roots of x^2 - 9x + 20 = 0.

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

Correct answer: D. 4 and 5

The equation factors as (x-4)(x-5) = 0.

Q126. What is the cube root of 64?

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

Correct answer: B. 4

4^3 = 64.

Q127. If 3x + 9 = 45, find x.

  1. 11
  2. 14
  3. 13
  4. 12
Show answer and explanation

Correct answer: D. 12

3x = 36, so x = 12.

Q128. Simplify: (6+1)^2 - (6-1)^2

  1. 26
  2. 24
  3. 36
  4. 12
Show answer and explanation

Correct answer: B. 24

Using (p+q)^2-(p-q)^2 = 4pq = 4a.

Q129. How many sides does a hexagon have?

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

Correct answer: C. 6

A hexagon has six sides.

Q130. What is 6.5 + 6.0?

  1. 12.6
  2. 12.4
  3. 13.5
  4. 12.5
Show answer and explanation

Correct answer: D. 12.5

6.5 + 6.0 = 12.5.

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