Add 21/15 and 4/72
1st number: 1 6/15, 2nd number: 4/72
21/15 + 4/72 is 131/90.
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,
4/72 = 4 × 5/72 × 5 = 20/360 - Add the two like fractions:
504/360 + 20/360 = 504 + 20/360 = 524/360 - 524/360 simplified gives 131/90
- So, 21/15 + 4/72 = 131/90
In mixed form: 141/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+4/72 21/15+8/72 21/30+4/72 63/15+4/72 21/15+12/72 21/45+4/72 21/15+20/72 21/75+4/72 21/15+28/72