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Square Root and Cube Root MCQs

Square Root and Cube Root MCQs test how to find roots of whole numbers, fractions and decimals, and how to use them to simplify expressions. They help aptitude test candidates calculate quickly without a calculator, and each question shows its correct answer immediately so you can confirm every step.

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About Square Root and Cube Root MCQs

This topic covers root calculations that appear in almost every quantitative section. Questions ask for the cube root of small decimals such as 0.000216, which is 0.06, and the square root of numbers like 1.5625, which is 1.25. You will also simplify expressions using a given value such as the square root of 5, find the least perfect square divisible by several numbers using their L.C.M and prime factors, and solve word problems where a group collects as many paise from each member as there are members. Pairing decimal places correctly is the key skill.

Exams that include Square Root and Cube Root MCQs

Pakistan

  • NTS
  • FPSC
  • PPSC
  • OTS
  • Army/Navy/PAF initial tests

India

  • SSC CGL
  • SSC CHSL
  • IBPS Clerk
  • RRB Group D

Bangladesh

  • Bank job exams
  • Primary Assistant Teacher recruitment
  • Government job tests

Frequently asked questions

How do you find the cube root of a decimal like 0.000216?

Group the decimal digits in threes from the decimal point. 0.000216 has six decimal places, so its cube root has two. The cube root of 216 is 6, so the cube root of 0.000216 is 0.06. For square roots, group decimal digits in pairs instead.

How do you find the least perfect square divisible by given numbers?

Find the L.C.M of the numbers, write it in prime factors, and multiply by any prime that appears an odd number of times. For 21, 36 and 66, the L.C.M is 2772, which equals 2 squared times 3 squared times 7 times 11, so multiply by 77 to get 213444.

Last reviewed October 2026