Add 21/18 and 3/72
1st number: 1 3/18, 2nd number: 3/72
21/18 + 3/72 is 29/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
21/18 = 21 × 4/18 × 4 = 84/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
3/72 = 3 × 1/72 × 1 = 3/72 - Add the two like fractions:
84/72 + 3/72 = 84 + 3/72 = 87/72 - 87/72 simplified gives 29/24
- So, 21/18 + 3/72 = 29/24
In mixed form: 15/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+3/72 21/18+6/72 21/36+3/72 63/18+3/72 21/18+9/72 21/54+3/72 21/18+15/72 21/90+3/72 21/18+21/72