Subtract 4/72 from 20/30
20/30 - 4/72 is 11/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 30 × 12 = 360,
20/30 = 20 × 12/30 × 12 = 240/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
4/72 = 4 × 5/72 × 5 = 20/360 - Subtract the two like fractions:
240/360 - 20/360 = 240 - 20/360 = 220/360 - After reducing the fraction, the answer is 11/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-4/72 20/30-8/72 20/60-4/72 60/30-4/72 20/30-12/72 20/90-4/72 20/30-20/72 20/30-28/72