Add 30/72 and 21/54
30/72 + 21/54 is 29/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 54 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 72 × 3 = 216,
30/72 = 30 × 3/72 × 3 = 90/216 - Likewise, for the 2nd fraction, since 54 × 4 = 216,
21/54 = 21 × 4/54 × 4 = 84/216 - Add the two like fractions:
90/216 + 84/216 = 90 + 84/216 = 174/216 - 174/216 simplified gives 29/36
- So, 30/72 + 21/54 = 29/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/72+21/54 30/72+42/54 90/72+21/54 30/72+63/54