Subtract 20/40 from 1/8
1/8 - 20/40 is -3/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
1/8 = 1 × 5/8 × 5 = 5/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
20/40 = 20 × 1/40 × 1 = 20/40 - Subtract the two like fractions:
5/40 - 20/40 = 5 - 20/40 = -15/40 - After reducing the fraction, the answer is -3/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/8-20/40 1/16-20/40 1/8-20/80 3/8-20/40 1/8-60/40 1/24-20/40 5/8-20/40 1/40-20/40 7/8-20/40 1/56-20/40