Add 7/21 and 72/28
1st number: 7/21, 2nd number: 2 16/28
7/21 + 72/28 is 61/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
72/28 = 72 × 3/28 × 3 = 216/84 - Add the two like fractions:
28/84 + 216/84 = 28 + 216/84 = 244/84 - 244/84 simplified gives 61/21
- So, 7/21 + 72/28 = 61/21
In mixed form: 219/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+72/28 7/42+72/28 7/21+72/56 7/63+72/28 7/21+72/84 35/21+72/28 49/21+72/28