Subtract 9/40 from 3/20
3/20 - 9/40 is -3/40.
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,
3/20 = 3 × 2/20 × 2 = 6/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
9/40 = 9 × 1/40 × 1 = 9/40 - Subtract the two like fractions:
6/40 - 9/40 = 6 - 9/40 = -3/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20-9/40 3/20-18/40 3/40-9/40 3/20-9/80 9/20-9/40 3/20-27/40 3/60-9/40 15/20-9/40 3/20-45/40 21/20-9/40 3/20-63/40