Subtract 4/8 from 3/40
3/40 - 4/8 is -17/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
3/40 = 3 × 1/40 × 1 = 3/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
4/8 = 4 × 5/8 × 5 = 20/40 - Subtract the two like fractions:
3/40 - 20/40 = 3 - 20/40 = -17/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/40-4/8 3/80-4/8 3/40-4/16 9/40-4/8 3/40-12/8 3/40-4/24 15/40-4/8 3/40-20/8 3/40-4/40 21/40-4/8 3/40-28/8 3/40-4/56