Subtract 9/32 from 20/72
20/72 - 9/32 is -1/288.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 32 is 288
Next, find the equivalent fraction of both fractional numbers with denominator 288 - For the 1st fraction, since 72 × 4 = 288,
20/72 = 20 × 4/72 × 4 = 80/288 - Likewise, for the 2nd fraction, since 32 × 9 = 288,
9/32 = 9 × 9/32 × 9 = 81/288 - Subtract the two like fractions:
80/288 - 81/288 = 80 - 81/288 = -1/288
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72-9/32 20/72-18/32 20/72-9/64 60/72-9/32 20/72-27/32 20/72-9/96 20/72-45/32 20/72-63/32