Add 21/70 and 30/36
21/70 + 30/36 is 17/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 36 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 70 × 18 = 1260,
21/70 = 21 × 18/70 × 18 = 378/1260 - Likewise, for the 2nd fraction, since 36 × 35 = 1260,
30/36 = 30 × 35/36 × 35 = 1050/1260 - Add the two like fractions:
378/1260 + 1050/1260 = 378 + 1050/1260 = 1428/1260 - 1428/1260 simplified gives 17/15
- So, 21/70 + 30/36 = 17/15
In mixed form: 12/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+30/36 21/70+60/36 21/70+30/72 63/70+30/36 21/70+90/36