Worksheets › Class 6 › Prime Time
Class 6 Prime Time worksheet
CBSE Mathematics. Factors, multiples, primes, divisibility, HCF and LCM. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Which of these is a prime number?
- 81
- 57
- 91
- 37
Answer
(d) 37
37 has exactly two factors, 1 and 37
- 2.
The HCF of 45 and 18 is:
- 10
- 90
- 18
- 9
Answer
(d) 9
45 = 9 × 5, 18 = 9 × 2
- 3.
The LCM of 10 and 4 is:
- 20
- 40
- 2
- 14
Answer
(a) 20
LCM = 10 × 4 ÷ HCF 2 = 20
Section B · short answer
- 4.
Write the prime factorisation of 180.
Answer
2 × 2 × 3 × 3 × 5
keep dividing by the smallest prime: 2 × 2 × 3 × 3 × 5 = 180
- 5.
Find the HCF of 60 and 72.
Answer
12
60 = 12 × 5; 72 = 12 × 6; HCF = 12
Section C · long answer
- 6.
Two school bells ring every 9 and 30 minutes. They ring together at 8:00 am. When will they next ring together?
Answer
9:30 am (90 minutes later)
LCM of 9 and 30 = 90 minutes
Fresh sheets for your child
In the app, every Prime Time sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.