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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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Q71. What is the HCF of 12 and 30?

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

Correct answer: A. 6

The greatest common divisor of 12 and 30 is 6.

Q72. Simplify: (5+1)^2 - (5-1)^2

  1. 20
  2. 25
  3. 10
  4. 22
Show answer and explanation

Correct answer: A. 20

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

Q73. What is the area of a square of side 8 cm (in sq cm)?

  1. 72
  2. 128
  3. 64
  4. 32
Show answer and explanation

Correct answer: C. 64

Area = side^2 = 64.

Q74. What is the LCM of 12 and 18?

  1. 72
  2. 30
  3. 42
  4. 36
Show answer and explanation

Correct answer: D. 36

LCM = (x*y)/HCF = 216/6 = 36.

Q75. What is the sum of interior angles of a polygon with 12 sides?

  1. 1800 degrees
  2. 1980 degrees
  3. 2160 degrees
  4. 1890 degrees
Show answer and explanation

Correct answer: A. 1800 degrees

Sum = (n-2) x 180 = 1800.

Q76. A can finish a job in 12 days and B in 12 days. How many days will they take working together?

  1. 8
  2. 6
  3. 24
  4. 7
Show answer and explanation

Correct answer: B. 6

Combined rate = 1/12 + 1/12; time = 144/24.

Q77. A car travels at 45 km/h for 3 hours. How far does it travel (in km)?

  1. 180
  2. 155
  3. 135
  4. 125
Show answer and explanation

Correct answer: C. 135

Distance = speed x time = 135 km.

Q78. If 20% of a number is 30, what is the number?

  1. 170
  2. 150
  3. 130
  4. 300
Show answer and explanation

Correct answer: B. 150

Number = 30 x 100/20 = 150.

Q79. What is the LCM of 28 and 49?

  1. 196
  2. 203
  3. 189
  4. 392
Show answer and explanation

Correct answer: A. 196

LCM = (x*y)/HCF = 1372/7 = 196.

Q80. Find the volume of a cuboid of 12 cm x 9 cm x 8 cm (in cubic cm).

  1. 855
  2. 876
  3. 552
  4. 864
Show answer and explanation

Correct answer: D. 864

Volume = lbh = 864.

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