Add 7/21 and 81/15
1st number: 7/21, 2nd number: 5 6/15
7/21 + 81/15 is 86/15.
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,
7/21 = 7 × 5/21 × 5 = 35/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
81/15 = 81 × 7/15 × 7 = 567/105 - Add the two like fractions:
35/105 + 567/105 = 35 + 567/105 = 602/105 - 602/105 simplified gives 86/15
- So, 7/21 + 81/15 = 86/15
In mixed form: 511/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+81/15 7/42+81/15 7/21+81/30 7/63+81/15 7/21+81/45 35/21+81/15 7/21+81/75 49/21+81/15