Add 18/40 and 20/45
18/40 + 20/45 is 161/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
18/40 = 18 × 9/40 × 9 = 162/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
20/45 = 20 × 8/45 × 8 = 160/360 - Add the two like fractions:
162/360 + 160/360 = 162 + 160/360 = 322/360 - 322/360 simplified gives 161/180
- So, 18/40 + 20/45 = 161/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/40+20/45 18/40+40/45 18/80+20/45 18/40+20/90 54/40+20/45 18/40+60/45 90/40+20/45