Add 20/21 and 63/27
1st number: 20/21, 2nd number: 2 9/27
20/21 + 63/27 is 23/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
20/21 = 20 × 9/21 × 9 = 180/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
63/27 = 63 × 7/27 × 7 = 441/189 - Add the two like fractions:
180/189 + 441/189 = 180 + 441/189 = 621/189 - 621/189 simplified gives 23/7
- So, 20/21 + 63/27 = 23/7
In mixed form: 32/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+63/27 20/42+63/27 20/21+63/54 60/21+63/27 20/63+63/27 20/21+63/81