Add 80/15 and 63/21
1st number: 5 5/15, 2nd number: 3 0/21
80/15 + 63/21 is 25/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
80/15 = 80 × 7/15 × 7 = 560/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
63/21 = 63 × 5/21 × 5 = 315/105 - Add the two like fractions:
560/105 + 315/105 = 560 + 315/105 = 875/105 - 875/105 simplified gives 25/3
- So, 80/15 + 63/21 = 25/3
In mixed form: 81/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30+63/21 80/15+63/42 80/45+63/21 80/75+63/21