Add 72/21 and 3/4
1st number: 3 9/21, 2nd number: 3/4
72/21 + 3/4 is 117/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
72/21 = 72 × 4/21 × 4 = 288/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
3/4 = 3 × 21/4 × 21 = 63/84 - Add the two like fractions:
288/84 + 63/84 = 288 + 63/84 = 351/84 - 351/84 simplified gives 117/28
- So, 72/21 + 3/4 = 117/28
In mixed form: 45/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+6/4 72/42+3/4 72/21+3/8 72/21+9/4 72/63+3/4 72/21+3/12 72/21+15/4 72/21+3/20 72/21+21/4 72/21+3/28