Add 90/18 and 28/40
1st number: 5 0/18, 2nd number: 28/40
90/18 + 28/40 is 57/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
90/18 = 90 × 20/18 × 20 = 1800/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
28/40 = 28 × 9/40 × 9 = 252/360 - Add the two like fractions:
1800/360 + 252/360 = 1800 + 252/360 = 2052/360 - 2052/360 simplified gives 57/10
- So, 90/18 + 28/40 = 57/10
In mixed form: 57/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18+56/40 90/36+28/40 90/18+28/80 90/18+84/40 90/54+28/40