In a bag there are red, green and purple counters. 3/8 (in fractions) of the counters are red. 1/6 (in fractions) of the counters are green. What fraction of the counters are purple?
Add the two fractions together and subtract from 1 as follows:
3/8 + 1/6 = Equate the denominators using the LCM of 6 and 8 which is 24.
9/24 + 4/24 =
13/24. Now, you have to subtract this from 1:
1 - 13/24 =17/24 - fraction of the counters that are purple.