Add 5/21 and 80/15
1st number: 5/21, 2nd number: 5 5/15
5/21 + 80/15 is 39/7.
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,
5/21 = 5 × 5/21 × 5 = 25/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
80/15 = 80 × 7/15 × 7 = 560/105 - Add the two like fractions:
25/105 + 560/105 = 25 + 560/105 = 585/105 - 585/105 simplified gives 39/7
- So, 5/21 + 80/15 = 39/7
In mixed form: 54/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+80/15 5/42+80/15 5/21+80/30 15/21+80/15 5/63+80/15 5/21+80/45 25/21+80/15 5/21+80/75 35/21+80/15