Add 28/80 and 90/18
1st number: 28/80, 2nd number: 5 0/18
28/80 + 90/18 is 107/20.
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,
28/80 = 28 × 9/80 × 9 = 252/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
90/18 = 90 × 40/18 × 40 = 3600/720 - Add the two like fractions:
252/720 + 3600/720 = 252 + 3600/720 = 3852/720 - 3852/720 simplified gives 107/20
- So, 28/80 + 90/18 = 107/20
In mixed form: 57/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80+90/18 28/80+90/36 84/80+90/18 28/80+90/54