Add 75/80 and 21/18
1st number: 75/80, 2nd number: 1 3/18
75/80 + 21/18 is 101/48.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
75/80 = 75 × 9/80 × 9 = 675/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
21/18 = 21 × 40/18 × 40 = 840/720 - Add the two like fractions:
675/720 + 840/720 = 675 + 840/720 = 1515/720 - 1515/720 simplified gives 101/48
- So, 75/80 + 21/18 = 101/48
In mixed form: 25/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/80+42/18 75/80+21/36 75/80+63/18 75/80+21/54 75/80+21/90