Add 30/36 and 21/15
1st number: 30/36, 2nd number: 1 6/15
30/36 + 21/15 is 67/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 15 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
30/36 = 30 × 5/36 × 5 = 150/180 - Likewise, for the 2nd fraction, since 15 × 12 = 180,
21/15 = 21 × 12/15 × 12 = 252/180 - Add the two like fractions:
150/180 + 252/180 = 150 + 252/180 = 402/180 - 402/180 simplified gives 67/30
- So, 30/36 + 21/15 = 67/30
In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/36+21/15 30/36+42/15 30/72+21/15 30/36+21/30 90/36+21/15 30/36+63/15 30/36+21/45 30/36+21/75