If 20 counters are the whole set, what fraction of the set is 16 counters?

Answer 1

16 out of 20 is 16/20.
You can simplify that fraction by factoring the numerator and denominator and looking for common factors:
2*2*2*2 is the numerator 16
2*2*5 is the denominator 20
so we can divide both numerator and denominator by 2*2 or 4 to get the simplified fraction:
16/4 = 4
20/4 = 5
So our final simple fraction is 4/5

Answer 2

4/5

Answer 3

If 12 counters are 2/5, then what is the one?