Subtract 20/30 from 7/72
7/72 - 20/30 is -41/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 30 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 30 × 12 = 360,
20/30 = 20 × 12/30 × 12 = 240/360 - Subtract the two like fractions:
35/360 - 240/360 = 35 - 240/360 = -205/360 - After reducing the fraction, the answer is -41/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/72-20/30 7/72-40/30 7/72-20/60 21/72-20/30 7/72-60/30 7/72-20/90 35/72-20/30 49/72-20/30