Add 18/40 and 20/35
18/40 + 20/35 is 143/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 35 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
18/40 = 18 × 7/40 × 7 = 126/280 - Likewise, for the 2nd fraction, since 35 × 8 = 280,
20/35 = 20 × 8/35 × 8 = 160/280 - Add the two like fractions:
126/280 + 160/280 = 126 + 160/280 = 286/280 - 286/280 simplified gives 143/140
- So, 18/40 + 20/35 = 143/140
In mixed form: 13/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/40+20/35 18/40+40/35 18/80+20/35 18/40+20/70 54/40+20/35 18/40+60/35 90/40+20/35