Subtract 1/8 from 9/20
9/20 - 1/8 is 13/40.
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,
9/20 = 9 × 2/20 × 2 = 18/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
1/8 = 1 × 5/8 × 5 = 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: 18/20-1/8 9/20-2/8 9/40-1/8 9/20-1/16 27/20-1/8 9/20-3/8 9/60-1/8 9/20-1/24 45/20-1/8 9/20-5/8 9/20-1/40 63/20-1/8 9/20-7/8 9/20-1/56