Subtract 4/20 from 18/30
18/30 - 4/20 is 2/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
18/30 = 18 × 2/30 × 2 = 36/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
4/20 = 4 × 3/20 × 3 = 12/60 - Subtract the two like fractions:
36/60 - 12/60 = 36 - 12/60 = 24/60 - After reducing the fraction, the answer is 2/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30-4/20 18/30-8/20 18/60-4/20 18/30-4/40 54/30-4/20 18/30-12/20 18/90-4/20 18/30-4/60 90/30-4/20 18/30-28/20