Add 21/15 and 54/72
1st number: 1 6/15, 2nd number: 54/72
21/15 + 54/72 is 43/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 15 × 24 = 360,
21/15 = 21 × 24/15 × 24 = 504/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
54/72 = 54 × 5/72 × 5 = 270/360 - Add the two like fractions:
504/360 + 270/360 = 504 + 270/360 = 774/360 - 774/360 simplified gives 43/20
- So, 21/15 + 54/72 = 43/20
In mixed form: 23/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+54/72 21/30+54/72 63/15+54/72 21/45+54/72 21/75+54/72