Add 21/15 and 30/36
1st number: 1 6/15, 2nd number: 30/36
21/15 + 30/36 is 67/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 15 × 12 = 180,
21/15 = 21 × 12/15 × 12 = 252/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
30/36 = 30 × 5/36 × 5 = 150/180 - Add the two like fractions:
252/180 + 150/180 = 252 + 150/180 = 402/180 - 402/180 simplified gives 67/30
- So, 21/15 + 30/36 = 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: 42/15+30/36 21/15+60/36 21/30+30/36 21/15+30/72 63/15+30/36 21/15+90/36 21/45+30/36 21/75+30/36