Add 28/20 and 90/9
1st number: 1 8/20, 2nd number: 10 0/9
28/20 + 90/9 is 57/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
28/20 = 28 × 9/20 × 9 = 252/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
90/9 = 90 × 20/9 × 20 = 1800/180 - Add the two like fractions:
252/180 + 1800/180 = 252 + 1800/180 = 2052/180 - 2052/180 simplified gives 57/5
- So, 28/20 + 90/9 = 57/5
In mixed form: 112/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20+90/9 28/40+90/9 28/20+90/18 84/20+90/9 28/60+90/9 28/20+90/27 28/20+90/45 28/20+90/63