Add 90/7 and 21/40
1st number: 12 6/7, 2nd number: 21/40
90/7 + 21/40 is 3747/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
90/7 = 90 × 40/7 × 40 = 3600/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
21/40 = 21 × 7/40 × 7 = 147/280 - Add the two like fractions:
3600/280 + 147/280 = 3600 + 147/280 = 3747/280 - So, 90/7 + 21/40 = 3747/280
In mixed form: 13107/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7+42/40 90/14+21/40 90/7+21/80 90/7+63/40 90/21+21/40 90/35+21/40 90/49+21/40