Add 72/28 and 21/84
1st number: 2 16/28, 2nd number: 21/84
72/28 + 21/84 is 79/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
72/28 = 72 × 3/28 × 3 = 216/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
21/84 = 21 × 1/84 × 1 = 21/84 - Add the two like fractions:
216/84 + 21/84 = 216 + 21/84 = 237/84 - 237/84 simplified gives 79/28
- So, 72/28 + 21/84 = 79/28
In mixed form: 223/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/28+42/84 72/56+21/84 72/28+63/84 72/84+21/84