Riley has 250 marbles in his collection. 50 of the marbles are red.
The fraction
represents the 50 marbles that are red out of all the marbles. We can find out what percent of marbles are red by changing the fraction
to a percent.
The fraction
can be reduced to
by dividing both the numerator and denominator by the greatest common factor of 50 and 250.
1 ÷ 5 = 0.2
0.2 × 100 = 20%
Therefore, 20% of the marbles are red.