Add 21/35 and 20/12
1st number: 21/35, 2nd number: 1 8/12
21/35 + 20/12 is 34/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 12 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 35 × 12 = 420,
21/35 = 21 × 12/35 × 12 = 252/420 - Likewise, for the 2nd fraction, since 12 × 35 = 420,
20/12 = 20 × 35/12 × 35 = 700/420 - Add the two like fractions:
252/420 + 700/420 = 252 + 700/420 = 952/420 - 952/420 simplified gives 34/15
- So, 21/35 + 20/12 = 34/15
In mixed form: 24/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+20/12 21/35+40/12 21/70+20/12 21/35+20/24 63/35+20/12 21/35+60/12 21/35+20/36 21/35+20/60 21/35+20/84