Add 80/7 and 21/45
1st number: 11 3/7, 2nd number: 21/45
80/7 + 21/45 is 1249/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 7 × 45 = 315,
80/7 = 80 × 45/7 × 45 = 3600/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
21/45 = 21 × 7/45 × 7 = 147/315 - Add the two like fractions:
3600/315 + 147/315 = 3600 + 147/315 = 3747/315 - 3747/315 simplified gives 1249/105
- So, 80/7 + 21/45 = 1249/105
In mixed form: 1194/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/7+42/45 80/14+21/45 80/7+21/90 80/7+63/45 80/21+21/45 80/35+21/45 80/49+21/45