Add 36/21 and 28/20
1st number: 1 15/21, 2nd number: 1 8/20
36/21 + 28/20 is 109/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
36/21 = 36 × 20/21 × 20 = 720/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
28/20 = 28 × 21/20 × 21 = 588/420 - Add the two like fractions:
720/420 + 588/420 = 720 + 588/420 = 1308/420 - 1308/420 simplified gives 109/35
- So, 36/21 + 28/20 = 109/35
In mixed form: 34/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+28/20 36/21+56/20 36/42+28/20 36/21+28/40 36/21+84/20 36/63+28/20 36/21+28/60