Add 28/21 and 63/15
1st number: 1 7/21, 2nd number: 4 3/15
28/21 + 63/15 is 83/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
28/21 = 28 × 5/21 × 5 = 140/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
63/15 = 63 × 7/15 × 7 = 441/105 - Add the two like fractions:
140/105 + 441/105 = 140 + 441/105 = 581/105 - 581/105 simplified gives 83/15
- So, 28/21 + 63/15 = 83/15
In mixed form: 58/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+63/15 28/42+63/15 28/21+63/30 84/21+63/15 28/63+63/15 28/21+63/45 28/21+63/75