Add 10/21 and 20/27
10/21 + 20/27 is 230/189.
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,
10/21 = 10 × 9/21 × 9 = 90/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
20/27 = 20 × 7/27 × 7 = 140/189 - Add the two like fractions:
90/189 + 140/189 = 90 + 140/189 = 230/189 - So, 10/21 + 20/27 = 230/189
In mixed form: 141/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+20/27 10/21+40/27 10/42+20/27 10/21+20/54 30/21+20/27 10/21+60/27 10/63+20/27 10/21+20/81 50/21+20/27 70/21+20/27