Question

What’s the least common multiple (LCM) for each group of numbers?
a. 15and 20
b. 16 and 19
c. 28and 36
d. 18 and 20​

Answer 1

(1) 15 and 20

15= 3*5

20=5*2*2

H.C.F ..is 5

l.C.M ..is 3*2*2*5= 60Ans

2) 16 and 19

16=2*2*2*2

19=19*1

H.C.F is zero

L.C.M is 19*2*2*2*2= 304.Ans

3) 28 and 36

28= 2*2*7

36=3*3*2*2

H.C.f is 2*2 =4

L.C.M is 2*2*3*3*7= 252

4) 18 and 20

18= 2*3*3

20=5*2*2

H.C.F is 2

L.C.M is 2*3*3*2*5= 180

Hope it is helpful to you