Add 10/21 and 42/27
1st number: 10/21, 2nd number: 1 15/27
10/21 + 42/27 is 128/63.
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,
42/27 = 42 × 7/27 × 7 = 294/189 - Add the two like fractions:
90/189 + 294/189 = 90 + 294/189 = 384/189 - 384/189 simplified gives 128/63
- So, 10/21 + 42/27 = 128/63
In mixed form: 22/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+42/27 10/21+84/27 10/42+42/27 10/21+42/54 30/21+42/27 10/63+42/27 10/21+42/81 50/21+42/27 70/21+42/27