Subtract 1/40 from 15/20
15/20 - 1/40 is 29/40.
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,
15/20 = 15 × 2/20 × 2 = 30/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
1/40 = 1 × 1/40 × 1 = 1/40 - Subtract the two like fractions:
30/40 - 1/40 = 30 - 1/40 = 29/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-1/40 15/20-2/40 15/40-1/40 15/20-1/80 45/20-1/40 15/20-3/40 15/60-1/40 75/20-1/40 15/20-5/40 15/20-7/40