Online Test — Factors, Multiples, HCF & LCM
10 Questions • 30 min • Chapter MCQ
30:00
Question 1 of 10
easy
Which number is PRIME?
9
11
15
21
Explanation: 11 has only the factors 1 and 11.
Question 2 of 10
medium
Which of these numbers is composite?
17
19
21
23
Explanation: 21 = 3 × 7, so it is composite.
Question 3 of 10
medium
LCM of 6 and 8 = ?
24
48
12
16
Explanation: Smallest common multiple of 6 and 8 is 24.
Question 4 of 10
medium
Which is a multiple of 9?
27
20
25
32
Explanation: 9 × 3 = 27.
Question 5 of 10
medium
HCF of 9 and 15 = ?
3
5
9
1
Explanation: Common factors are 1, 3 → highest is 3.
Question 6 of 10
hard
How many factors does 16 have?
3
4
5
6
Explanation: 1, 2, 4, 8, 16 → five factors.
Question 7 of 10
hard
How many prime numbers are there between 1 and 10?
3
4
5
6
Explanation: 2, 3, 5, 7 → four primes.
Question 8 of 10
easy
LCM of 3 and 5 = ?
8
15
30
10
Explanation: No common factor, so 3 × 5 = 15.
Question 9 of 10
easy
Which of these is a factor of 18?
5
9
7
4
Explanation: 18 ÷ 9 = 2 exactly.
Question 10 of 10
hard
LCM of 5 and 7 = ?
12
35
70
57
Explanation: No common factor, so 5 × 7 = 35.