Add 10/21 and 84/15
1st number: 10/21, 2nd number: 5 9/15
10/21 + 84/15 is 638/105.
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,
10/21 = 10 × 5/21 × 5 = 50/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
84/15 = 84 × 7/15 × 7 = 588/105 - Add the two like fractions:
50/105 + 588/105 = 50 + 588/105 = 638/105 - So, 10/21 + 84/15 = 638/105
In mixed form: 68/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+84/15 10/42+84/15 10/21+84/30 30/21+84/15 10/63+84/15 10/21+84/45 50/21+84/15 10/21+84/75 70/21+84/15