Subtract 1/72 from 18/20
18/20 - 1/72 is 319/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
18/20 = 18 × 18/20 × 18 = 324/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
1/72 = 1 × 5/72 × 5 = 5/360 - Subtract the two like fractions:
324/360 - 5/360 = 324 - 5/360 = 319/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20-1/72 18/20-2/72 18/40-1/72 54/20-1/72 18/20-3/72 18/60-1/72 90/20-1/72 18/20-5/72 18/20-7/72