Question

Match the two numbers with their least common multiple (LCM).

10 and 4 A) 30

10 and 6 B) 40

10 and 8 C) 20

Which ones match the answers?

Answer 1

LCM:
10: 0,10,20,30,40,50
4: 0,4,8,12,16,20
ANSWER IS 20

LCM:
10: see above numbers
6: 0,6,12,18,24,30
ANSWER IS 30

So, 10 and 8 would be 40

Answer 2

Explanation:

We have to find the LCM of the given numbers and match then with their options given.

LCM of 10 and 4

factors of 10 = 2 × 5

factors of 4 = 2 × 2

LCM = 2 × 5 × 2 = 20 Matches (C)

LCM of 10 and 6

factors of 10 = 2 × 5

factors of 6 = 2 × 3

LCM = 2 × 3 × 5 = 30 Matches (A)

LCM of 10 and 8

factors of 10 = 2 × 5

factors of 8 = 2 × 2 × 2

LCM = 2 × 5 × 2 × 2 = 40 Matches (B)