Subtract 5/40 from 9/20
9/20 - 5/40 is 13/40.
Steps for subtracting 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,
9/20 = 9 × 2/20 × 2 = 18/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
5/40 = 5 × 1/40 × 1 = 5/40 - Subtract the two like fractions:
18/40 - 5/40 = 18 - 5/40 = 13/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-5/40 9/20-10/40 9/40-5/40 9/20-5/80 27/20-5/40 9/20-15/40 9/60-5/40 45/20-5/40 9/20-25/40 63/20-5/40 9/20-35/40