Add 24/21 and 20/28
1st number: 1 3/21, 2nd number: 20/28
24/21 + 20/28 is 13/7.
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,
24/21 = 24 × 4/21 × 4 = 96/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
20/28 = 20 × 3/28 × 3 = 60/84 - Add the two like fractions:
96/84 + 60/84 = 96 + 60/84 = 156/84 - 156/84 simplified gives 13/7
- So, 24/21 + 20/28 = 13/7
In mixed form: 16/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/21+20/28 24/21+40/28 24/42+20/28 24/21+20/56 72/21+20/28 24/21+60/28 24/63+20/28 24/21+20/84