Subtract 7/20 from 3/72
3/72 - 7/20 is -37/120.
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,
3/72 = 3 × 5/72 × 5 = 15/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
7/20 = 7 × 18/20 × 18 = 126/360 - Subtract the two like fractions:
15/360 - 126/360 = 15 - 126/360 = -111/360 - After reducing the fraction, the answer is -37/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/72-7/20 3/72-14/20 3/72-7/40 9/72-7/20 3/72-21/20 3/72-7/60 15/72-7/20 3/72-35/20 21/72-7/20 3/72-49/20