Subtract 1/8 from 7/20
7/20 - 1/8 is 9/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
7/20 = 7 × 2/20 × 2 = 14/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
1/8 = 1 × 5/8 × 5 = 5/40 - Subtract the two like fractions:
14/40 - 5/40 = 14 - 5/40 = 9/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-1/8 7/20-2/8 7/40-1/8 7/20-1/16 21/20-1/8 7/20-3/8 7/60-1/8 7/20-1/24 35/20-1/8 7/20-5/8 7/20-1/40 49/20-1/8 7/20-7/8 7/20-1/56