Add 36/20 and 20/21
1st number: 1 16/20, 2nd number: 20/21
36/20 + 20/21 is 289/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
36/20 = 36 × 21/20 × 21 = 756/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
20/21 = 20 × 20/21 × 20 = 400/420 - Add the two like fractions:
756/420 + 400/420 = 756 + 400/420 = 1156/420 - 1156/420 simplified gives 289/105
- So, 36/20 + 20/21 = 289/105
In mixed form: 279/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+20/21 36/20+40/21 36/40+20/21 36/20+20/42 36/20+60/21 36/60+20/21 36/20+20/63