Add 21/56 and 15/54
21/56 + 15/54 is 47/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 54 is 1512
Next, find the equivalent fraction of both fractional numbers with denominator 1512 - For the 1st fraction, since 56 × 27 = 1512,
21/56 = 21 × 27/56 × 27 = 567/1512 - Likewise, for the 2nd fraction, since 54 × 28 = 1512,
15/54 = 15 × 28/54 × 28 = 420/1512 - Add the two like fractions:
567/1512 + 420/1512 = 567 + 420/1512 = 987/1512 - 987/1512 simplified gives 47/72
- So, 21/56 + 15/54 = 47/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56+15/54 21/56+30/54 63/56+15/54 21/56+45/54 21/56+75/54