Subtract 1/72 from 7/20
7/20 - 1/72 is 121/360.
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,
7/20 = 7 × 18/20 × 18 = 126/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
1/72 = 1 × 5/72 × 5 = 5/360 - Subtract the two like fractions:
126/360 - 5/360 = 126 - 5/360 = 121/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-1/72 7/20-2/72 7/40-1/72 21/20-1/72 7/20-3/72 7/60-1/72 35/20-1/72 7/20-5/72 49/20-1/72 7/20-7/72