Class 6 Mathematics Chapter 5: Prime Time — practice questions with answers
Free practice for Class 6 Mathematics, Chapter 5: Prime Time. Try the solved questions below, then take a free test with instant marking and explanations.
36 questions9 easy, 17 medium, 10 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. In the idli-vada game with 3 and 5, what is the first number for which players say ‘idli-vada’?
Show answer
Answer: 15 (± 0)
Why: The first number that is a multiple of both 3 and 5 is 15. [p.107]
Why: The first number that is a multiple of both 3 and 5 is 15. [p.107]
Q2. Numbers that are multiples of both 3 and 5 (like 15, 30, 45) are called ______ multiples of 3 and 5.
Show answer
Answer: common
Why: Numbers that are multiples of two numbers at the same time are their common multiples. [p.107]
Why: Numbers that are multiples of two numbers at the same time are their common multiples. [p.107]
Q3. Which multiples of 40 lie between 310 and 410?
- 320, 360, 400
- 320, 360
- 340, 380
- 310, 350, 390
Show answer
Answer: A. 320, 360, 400
Why: 40 × 8 = 320, 40 × 9 = 360, 40 × 10 = 400: 320, 360, 400. [p.110]
Why: 40 × 8 = 320, 40 × 9 = 360, 40 × 10 = 400: 320, 360, 400. [p.110]
Q4. Numbers that have exactly two factors (1 and the number itself) are called ______ numbers.
Show answer
Answer: prime
Why: Anshu’s 7 figs can be arranged in only one rectangle (1 × 7) because 7 has only two factors — it is a prime. [p.112]
Why: Anshu’s 7 figs can be arranged in only one rectangle (1 × 7) because 7 has only two factors — it is a prime. [p.112]
Q5. The number 1 is ______.
- neither prime nor composite
- a prime number
- a composite number
- both prime and composite
Show answer
Answer: A. neither prime nor composite
Why: 1 has only one factor, so it is neither prime (two factors) nor composite (more than two). [p.113]
Why: 1 has only one factor, so it is neither prime (two factors) nor composite (more than two). [p.113]
Q6. How many prime numbers are there from 21 to 30?
Show answer
Answer: 2 (± 0)
Why: The primes are [23, 29], so there are 2. [p.113]
Why: The primes are [23, 29], so there are 2. [p.113]
Practise all 36 questions free
Timed test, marked instantly, with the correct answer and explanation for every question and a chapter-wise report.
Start the free testUnderstand it by doing
Try the interactive Maths Lab for Class 6.
Frequently asked questions
How many practice questions are there for Class 6 Mathematics Chapter 5: Prime Time?
36 questions (9 easy, 17 medium, 10 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 6 Mathematics syllabus, used by CBSE and many state boards.