Add 80/21 and 7/8
1st number: 3 17/21, 2nd number: 7/8
80/21 + 7/8 is 787/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
80/21 = 80 × 8/21 × 8 = 640/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
7/8 = 7 × 21/8 × 21 = 147/168 - Add the two like fractions:
640/168 + 147/168 = 640 + 147/168 = 787/168 - So, 80/21 + 7/8 = 787/168
In mixed form: 4115/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+14/8 80/42+7/8 80/21+7/16 80/21+21/8 80/63+7/8 80/21+7/24 80/21+35/8 80/21+7/40 80/21+49/8 80/21+7/56