Subtract 18/20 from 4/32
4/32 - 18/20 is -31/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 32 and 20 is 160
Next, find the equivalent fraction of both fractional numbers with denominator 160 - For the 1st fraction, since 32 × 5 = 160,
4/32 = 4 × 5/32 × 5 = 20/160 - Likewise, for the 2nd fraction, since 20 × 8 = 160,
18/20 = 18 × 8/20 × 8 = 144/160 - Subtract the two like fractions:
20/160 - 144/160 = 20 - 144/160 = -124/160 - After reducing the fraction, the answer is -31/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/32-18/20 4/32-36/20 4/64-18/20 4/32-18/40 12/32-18/20 4/32-54/20 4/96-18/20 4/32-18/60 20/32-18/20 4/32-90/20 28/32-18/20