Add 18/90 and 20/40
18/90 + 20/40 is 7/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
18/90 = 18 × 4/90 × 4 = 72/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
20/40 = 20 × 9/40 × 9 = 180/360 - Add the two like fractions:
72/360 + 180/360 = 72 + 180/360 = 252/360 - 252/360 simplified gives 7/10
- So, 18/90 + 20/40 = 7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/90+20/40 18/90+20/80 54/90+20/40 18/90+60/40