Question

What is the least common denominator of 6, 15, 40?

Answer 1

You'll have to factorize into primes first:

Explanation:

`6=2xx3`
`15=3xx5`
`40=2xx2xx2xx5`
Then you take all factors to the highest power present in each one of them:
`2xx2xx2xx3xx5=120`

Check your answer!
`120div6=20=2xx2xx5`
`120div15=8=2xx2xx2`
`120div40=3`
And these have no common factor between the three of them.
(or else it wouldn't be the least common denominator)