Add 81/80 and 5/28
1st number: 1 1/80, 2nd number: 5/28
81/80 + 5/28 is 667/560.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 28 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
81/80 = 81 × 7/80 × 7 = 567/560 - Likewise, for the 2nd fraction, since 28 × 20 = 560,
5/28 = 5 × 20/28 × 20 = 100/560 - Add the two like fractions:
567/560 + 100/560 = 567 + 100/560 = 667/560 - So, 81/80 + 5/28 = 667/560
In mixed form: 1107/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80+10/28 81/80+5/56 81/80+15/28 81/80+5/84 81/80+25/28 81/80+35/28