Online Test — Factors, Multiples, HCF & LCM
10 Questions • 30 min • Chapter MCQ
30:00
Question 1 of 10
easy
LCM of 3 and 5 = ?
8
15
30
10
Explanation: No common factor, so 3 × 5 = 15.
Question 2 of 10
easy
LCM of 4 and 6 = ?
10
12
18
24
Explanation: 12 is the first number in both times-tables.
Question 3 of 10
hard
How many factors does 16 have?
3
4
5
6
Explanation: 1, 2, 4, 8, 16 → five factors.
Question 4 of 10
medium
Is 1 prime or composite?
prime
composite
neither
both
Explanation: 1 has only one factor, so it is neither prime nor composite.
Question 5 of 10
medium
LCM of 6 and 8 = ?
24
48
12
16
Explanation: Smallest common multiple of 6 and 8 is 24.
Question 6 of 10
easy
How many factors does a prime number have?
1
2
3
many
Explanation: Exactly two: 1 and itself.
Question 7 of 10
easy
Which number is a factor of every number?
0
1
2
10
Explanation: 1 divides every number exactly.
Question 8 of 10
medium
Which number is a factor of BOTH 6 and 9?
2
3
6
9
Explanation: 3 divides both 6 and 9.
Question 9 of 10
medium
Is 20 a multiple of 5?
Yes
No
Only sometimes
Cannot tell
Explanation: 5 × 4 = 20, so yes.
Question 10 of 10
medium
Which list contains only PRIME numbers?
2, 3, 5, 7
2, 4, 6, 8
1, 3, 5, 9
3, 5, 9, 11
Explanation: 2, 3, 5, 7 are all prime.