Test Grade 8 and 9 (Prime and composite number, prime factorization, HCF and LCM)
Name _______________________________________
1. The composite numbers has
a. more than two factors
b. infinite factors
c. one factor
d. two factors
________[1]
2. The smallest prime number is
a. 4
b. 2
c. 3
d. 5
________[1]
3. The largest composite number less than 40 is
a. 31
b. 37
c. 33
d. 39
________[1]
4. The largest prime number less than 20 is
a. 16
b. 15
c. 19
d. 18
________[2]
5. The numbers that have only two factors and are different from each other are called
a. odd numbers
b. prime numbers
c. composite numbers
d. even numbers
________[1]
6. Considering the prime factorization, the prime factors of 680 are
a. 2 × 32 × 52
b. 23 × 5 × 17
c. 2 × 3 × 52
d. 23 × 5 × 11
________[2]
7. Considering the prime factorization, the prime factors of 440 are
a. 2 × 5 × 7
b. 2 × 3 × 52
c. 23 × 5 × 11
d. 2 × 32 × 52
________[2]
8. The Highest Common Factor (HCF) of 140, 308 and 490 is
a. 15
b. 14
c. 18
d. 11
________[2]
9. The HCF of 450 and 540 is
a. 30
b. 24
c. 20
d. 16
________[2]
10. Mary has 24 pastries and wants to share pastries with her 20 friends. The greatest number of
pastries any friend can get
a. 5
b. 6
c. 4
d. 2
________[2]
11. What is the least common multiple (LCM) of 15 and 2?
a. 30
b. 2
c. 45
d. 152
________[2]
12. Find the Least Common Multiple of 9 and 6
a. 18
b. 36
c. 38
d. 72
________[2]