Add 21/15 and 9/72
1st number: 1 6/15, 2nd number: 9/72
21/15 + 9/72 is 61/40.
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,
9/72 = 9 × 5/72 × 5 = 45/360 - Add the two like fractions:
504/360 + 45/360 = 504 + 45/360 = 549/360 - 549/360 simplified gives 61/40
- So, 21/15 + 9/72 = 61/40
In mixed form: 121/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+9/72 21/15+18/72 21/30+9/72 63/15+9/72 21/15+27/72 21/45+9/72 21/15+45/72 21/75+9/72 21/15+63/72