Factors, Prime Numbers, HCF, LCM

1. The factor of 20 is ....

• 21

• 17

• 9

• 5

2. The factor of 36 is ....

• 5

• 6

• 7

• 8

3. The factor of 63 are ....

• 7

• 11

• 21

• 32

4. Which are the prime numbers ?

• 11

• 6

• 4

• 2

5. The prime numbers between 10 and 15 are ....

• 11 and 14

• 11 and 13

• 10 and 12

• 10 and 11

6. The prime factorization of 12 is ....

• 1 x 2 x 2

• 1 x 2 x 3

• 2 x 2 x 3

• 2 x 3 x 3

7. The prime factorization of 45 is ....

• 2 x 3 x 5

• 2 x 4 x 5

• 3 x 4 x 5

• 3 x 3 x 5

8.

2 x 2 x 2 x 3 x 3 is the prime factorization of ....

• 54

• 63

• 72

• 81

9. The Highest Common Factor of 20 and 30 is ....

• 10

• 20

• 30

• 40

10. The Highest Common Factor of 36 and 48 is ....

• 10

• 11

• 12

• 13