Question

What's the highest common multiple of 16 and 24

Answer 1

The highest common multiple???  That would be infinity...

Highest common factor?  That would be the product of shared primes of the numbers prime factorization...

16=2*2*2*2, 24=2*2*2*3 so the product of shared primes is 2^3=8

So 8 would be the greatest common factor

Least common multiple?

That would be the product of the highest occurring primes in their prime factorization...

16=2*2*2*2, 24=2*2*2*3 so the product of highest occurring primes is:

2*2*2*2*3=48

So 48 would be the least common multiple....

The "highest common multiple" would be 48n where n would approach infinity so it would be +oo

Answer 2

The highest common multiple of 16 and 24 is 48.
3 x 16 = 48
2 x 24 = 48