Add 21/54 and 20/28
21/54 + 20/28 is 139/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 28 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 54 × 14 = 756,
21/54 = 21 × 14/54 × 14 = 294/756 - Likewise, for the 2nd fraction, since 28 × 27 = 756,
20/28 = 20 × 27/28 × 27 = 540/756 - Add the two like fractions:
294/756 + 540/756 = 294 + 540/756 = 834/756 - 834/756 simplified gives 139/126
- So, 21/54 + 20/28 = 139/126
In mixed form: 113/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54+20/28 21/54+40/28 21/54+20/56 63/54+20/28 21/54+60/28 21/54+20/84