Add 21/72 and 15/54
21/72 + 15/54 is 41/72.
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,
21/72 = 21 × 3/72 × 3 = 63/216 - Likewise, for the 2nd fraction, since 54 × 4 = 216,
15/54 = 15 × 4/54 × 4 = 60/216 - Add the two like fractions:
63/216 + 60/216 = 63 + 60/216 = 123/216 - 123/216 simplified gives 41/72
- So, 21/72 + 15/54 = 41/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+15/54 21/72+30/54 63/72+15/54 21/72+45/54 21/72+75/54