Primary 4 Mathematics Flashcards: LCM, HCF and Prime Numbers

Question 1

What is the LCM of 6 and 8?

Accepted Answer

24

Question 2

What is the LCM of 9 and 12?

Accepted Answer

36

Question 3

What is the LCM of 12 and 18?

Accepted Answer

36

Question 4

What is the LCM of 15 and 20?

Accepted Answer

60

Question 5

What is the LCM of 14 and 21?

Accepted Answer

42

Question 6

What is the LCM of 16 and 24?

Accepted Answer

48

Question 7

What is the LCM of 18 and 30?

Accepted Answer

90

Question 8

What is the LCM of 20 and 25?

Accepted Answer

100

Question 9

What is the HCF of 12 and 18?

Accepted Answer

6

Question 10

What is the HCF of 16 and 24?

Accepted Answer

8

Question 11

What is the HCF of 20 and 30?

Accepted Answer

10

Question 12

What is the HCF of 21 and 28?

Accepted Answer

7

Question 13

What is the HCF of 24 and 36?

Accepted Answer

12

Question 14

What is the HCF of 27 and 45?

Accepted Answer

9

Question 15

What is the HCF of 32 and 48?

Accepted Answer

16

Question 16

What is the HCF of 42 and 56?

Accepted Answer

14

Question 17

Classify 2 as prime or composite.

Accepted Answer

prime

Question 18

Classify 17 as prime or composite.

Accepted Answer

prime

Question 19

Classify 29 as prime or composite.

Accepted Answer

prime

Question 20

Classify 21 as prime or composite.

Accepted Answer

composite

Strong work.