Subtract 3/20 from 7/72
7/72 - 3/20 is -19/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
7/72 = 7 × 5/72 × 5 = 35/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
3/20 = 3 × 18/20 × 18 = 54/360 - Subtract the two like fractions:
35/360 - 54/360 = 35 - 54/360 = -19/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/72-3/20 7/72-6/20 7/72-3/40 21/72-3/20 7/72-9/20 7/72-3/60 35/72-3/20 7/72-15/20 49/72-3/20 7/72-21/20