Add 81/80 and 7/90
1st number: 1 1/80, 2nd number: 7/90
81/80 + 7/90 is 157/144.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
81/80 = 81 × 9/80 × 9 = 729/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
7/90 = 7 × 8/90 × 8 = 56/720 - Add the two like fractions:
729/720 + 56/720 = 729 + 56/720 = 785/720 - 785/720 simplified gives 157/144
- So, 81/80 + 7/90 = 157/144
In mixed form: 113/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80+14/90 81/80+21/90 81/80+35/90 81/80+49/90