Add 36/21 and 63/20
1st number: 1 15/21, 2nd number: 3 3/20
36/21 + 63/20 is 681/140.
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,
63/20 = 63 × 21/20 × 21 = 1323/420 - Add the two like fractions:
720/420 + 1323/420 = 720 + 1323/420 = 2043/420 - 2043/420 simplified gives 681/140
- So, 36/21 + 63/20 = 681/140
In mixed form: 4121/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+63/20 36/42+63/20 36/21+63/40 36/63+63/20 36/21+63/60