Add 28/40 and 18/90
28/40 + 18/90 is 9/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
28/40 = 28 × 9/40 × 9 = 252/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
18/90 = 18 × 4/90 × 4 = 72/360 - Add the two like fractions:
252/360 + 72/360 = 252 + 72/360 = 324/360 - 324/360 simplified gives 9/10
- So, 28/40 + 18/90 = 9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40+18/90 28/40+36/90 28/80+18/90 84/40+18/90 28/40+54/90