Add 20/18 and 28/40
1st number: 1 2/18, 2nd number: 28/40
20/18 + 28/40 is 163/90.
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,
20/18 = 20 × 20/18 × 20 = 400/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
28/40 = 28 × 9/40 × 9 = 252/360 - Add the two like fractions:
400/360 + 252/360 = 400 + 252/360 = 652/360 - 652/360 simplified gives 163/90
- So, 20/18 + 28/40 = 163/90
In mixed form: 173/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18+28/40 20/18+56/40 20/36+28/40 20/18+28/80 60/18+28/40 20/18+84/40 20/54+28/40 20/90+28/40