Add 8/21 and 28/20
1st number: 8/21, 2nd number: 1 8/20
8/21 + 28/20 is 187/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
8/21 = 8 × 20/21 × 20 = 160/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
28/20 = 28 × 21/20 × 21 = 588/420 - Add the two like fractions:
160/420 + 588/420 = 160 + 588/420 = 748/420 - 748/420 simplified gives 187/105
- So, 8/21 + 28/20 = 187/105
In mixed form: 182/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+28/20 8/21+56/20 8/42+28/20 8/21+28/40 24/21+28/20 8/21+84/20 8/63+28/20 8/21+28/60 40/21+28/20 56/21+28/20