Add 21/15 and 42/27
1st number: 1 6/15, 2nd number: 1 15/27
21/15 + 42/27 is 133/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 27 is 135
Next, find the equivalent fraction of both fractional numbers with denominator 135 - For the 1st fraction, since 15 × 9 = 135,
21/15 = 21 × 9/15 × 9 = 189/135 - Likewise, for the 2nd fraction, since 27 × 5 = 135,
42/27 = 42 × 5/27 × 5 = 210/135 - Add the two like fractions:
189/135 + 210/135 = 189 + 210/135 = 399/135 - 399/135 simplified gives 133/45
- So, 21/15 + 42/27 = 133/45
In mixed form: 243/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+42/27 21/15+84/27 21/30+42/27 21/15+42/54 63/15+42/27 21/45+42/27 21/15+42/81 21/75+42/27