Add 7/4 and 21/72
1st number: 1 3/4, 2nd number: 21/72
7/4 + 21/72 is 49/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 4 × 18 = 72,
7/4 = 7 × 18/4 × 18 = 126/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
21/72 = 21 × 1/72 × 1 = 21/72 - Add the two like fractions:
126/72 + 21/72 = 126 + 21/72 = 147/72 - 147/72 simplified gives 49/24
- So, 7/4 + 21/72 = 49/24
In mixed form: 21/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4+21/72 7/4+42/72 7/8+21/72 21/4+21/72 7/4+63/72 7/12+21/72 35/4+21/72 7/20+21/72 49/4+21/72 7/28+21/72