Subtract 9/40 from 1/20
1/20 - 9/40 is -7/40.
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,
1/20 = 1 × 2/20 × 2 = 2/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
9/40 = 9 × 1/40 × 1 = 9/40 - Subtract the two like fractions:
2/40 - 9/40 = 2 - 9/40 = -7/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20-9/40 1/20-18/40 1/40-9/40 1/20-9/80 3/20-9/40 1/20-27/40 1/60-9/40 5/20-9/40 1/20-45/40 7/20-9/40 1/20-63/40