Question

I need help on how to find the least common multiple!!

Answer 1

Its better to explain with an example
Find the lcm of 4 and 5
Write the multiples of 4 and 5

4 8 12 16 20 24 28 32 36 40
5 10 15 20 25 30 35 40

What number/s is/are common among the multiples of 4 and 5?

Answer 2

@thushannah I think thats the GCF you're talking about 5 isn't a multiple of 15 but rather a factor

Answer 3

yeah i am sorry, thtsthe HCF, i ws talking about
so in LCM for example 15 and 30

write them as product of prime numbers
15 = 3 * 5
50 = 2 * 5 * 5 (write the numbers below (if they r common) too)
LCM = 2 * 3 * 5 *5 =150