Number System questions and answers

20 questions in 2 online tests, each with its answer and a worked solution.

Start Test 1

Number System: key points

Number-system questions test divisibility, factors, remainders, primes and the properties of integers.

  • Use divisibility rules before long division.
  • For two numbers, product = HCF × LCM.
  • Check units digits and remainders for quick solutions.

How to practise Number System

Start with the key points, then take one Number System test without rushing. Review every explanation, note the steps you missed and repeat the topic against the clock. APTITUDE TESTER has 20 questions in 2 tests for this topic.

  • Read the method before attempting a timed test.
  • Record mistakes by type: concept, calculation or time management.
  • Return to the hardest questions after a day and try them again.

Continue with another Quantitative topic when your accuracy is steady.

Number System online tests

Sample Number System questions

  1. 1. Which remainder is obtained when 73 is divided by 3?
    1. 1
    2. 4
    3. 2
    4. 3

    Reference: q-3ff1136d-53 · Report this question

    Show answer and solution

    Answer: A. 1

    73 = 24×3 + 1.
  2. 2. Find the HCF of 48 and 12.
    1. 12
    2. 15
    3. 14
    4. 10

    Reference: q-c1067973-27 · Report this question

    Show answer and solution

    Answer: A. 12

    HCF(8×6, 2×6) = 6×HCF(8, 2) = 12.
  3. 3. What is the sum of the digits of 92?
    1. 11
    2. 9
    3. 14
    4. 8

    Reference: q-ca95188-37 · Report this question

    Show answer and solution

    Answer: A. 11

    Add the tens and units digits: 9 + 2.

See all the questions of Test 1

Number System: questions people ask

How many Number System questions are there?

There are 20 Number System questions in 2 tests. Each test has its own page that lists the questions with their answers and solutions.

How long does a Number System test take?

A test of 10 questions has a time limit of 15 minutes, which is 90 seconds a question.

Is there negative marking?

Rules vary by set. The rules screen shows the time limit, marks, any wrong-answer penalty and calculator permission before you begin. Feedback mode has no time limit or negative marking.

Can I practise Number System without a time limit?

Yes. Choose practice mode: there is no clock, and the answer and solution appear as soon as you select an option.