Add 18/20 and 9/40
18/20 + 9/40 is 9/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
18/20 = 18 × 2/20 × 2 = 36/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
9/40 = 9 × 1/40 × 1 = 9/40 - Add the two like fractions:
36/40 + 9/40 = 36 + 9/40 = 45/40 - 45/40 simplified gives 9/8
- So, 18/20 + 9/40 = 9/8
In mixed form: 11/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+9/40 18/20+18/40 18/40+9/40 18/20+9/80 54/20+9/40 18/20+27/40 18/60+9/40 90/20+9/40 18/20+45/40 18/20+63/40