Add 90/20 and 81/56
1st number: 4 10/20, 2nd number: 1 25/56
90/20 + 81/56 is 333/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 20 × 14 = 280,
90/20 = 90 × 14/20 × 14 = 1260/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
81/56 = 81 × 5/56 × 5 = 405/280 - Add the two like fractions:
1260/280 + 405/280 = 1260 + 405/280 = 1665/280 - 1665/280 simplified gives 333/56
- So, 90/20 + 81/56 = 333/56
In mixed form: 553/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+81/56 90/60+81/56