Add 10/21 and 21/54
10/21 + 21/54 is 109/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
10/21 = 10 × 18/21 × 18 = 180/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Add the two like fractions:
180/378 + 147/378 = 180 + 147/378 = 327/378 - 327/378 simplified gives 109/126
- So, 10/21 + 21/54 = 109/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+21/54 10/21+42/54 10/42+21/54 30/21+21/54 10/21+63/54 10/63+21/54 50/21+21/54 70/21+21/54