Add 80/21 and 36/28
1st number: 3 17/21, 2nd number: 1 8/28
80/21 + 36/28 is 107/21.
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,
80/21 = 80 × 4/21 × 4 = 320/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
36/28 = 36 × 3/28 × 3 = 108/84 - Add the two like fractions:
320/84 + 108/84 = 320 + 108/84 = 428/84 - 428/84 simplified gives 107/21
- So, 80/21 + 36/28 = 107/21
In mixed form: 52/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+72/28 80/42+36/28 80/21+36/56 80/63+36/28 80/21+36/84