Add 21/54 and 49/72
21/54 + 49/72 is 77/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 72 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 54 × 4 = 216,
21/54 = 21 × 4/54 × 4 = 84/216 - Likewise, for the 2nd fraction, since 72 × 3 = 216,
49/72 = 49 × 3/72 × 3 = 147/216 - Add the two like fractions:
84/216 + 147/216 = 84 + 147/216 = 231/216 - 231/216 simplified gives 77/72
- So, 21/54 + 49/72 = 77/72
In mixed form: 15/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54+49/72 21/54+98/72 63/54+49/72