Add 21/15 and 72/9
1st number: 1 6/15, 2nd number: 8 0/9
21/15 + 72/9 is 47/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
21/15 = 21 × 3/15 × 3 = 63/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
72/9 = 72 × 5/9 × 5 = 360/45 - Add the two like fractions:
63/45 + 360/45 = 63 + 360/45 = 423/45 - 423/45 simplified gives 47/5
- So, 21/15 + 72/9 = 47/5
In mixed form: 92/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+72/9 21/30+72/9 21/15+72/18 63/15+72/9 21/45+72/9 21/15+72/27 21/75+72/9 21/15+72/45 21/15+72/63