Add 90/75 and 21/15
1st number: 1 15/75, 2nd number: 1 6/15
90/75 + 21/15 is 13/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 15 is 75
Next, find the equivalent fraction of both fractional numbers with denominator 75 - For the 1st fraction, since 75 × 1 = 75,
90/75 = 90 × 1/75 × 1 = 90/75 - Likewise, for the 2nd fraction, since 15 × 5 = 75,
21/15 = 21 × 5/15 × 5 = 105/75 - Add the two like fractions:
90/75 + 105/75 = 90 + 105/75 = 195/75 - 195/75 simplified gives 13/5
- So, 90/75 + 21/15 = 13/5
In mixed form: 23/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75+42/15 90/75+21/30 90/75+63/15 90/75+21/45 90/75+21/75