Subtract 4/20 from 30/40
30/40 - 4/20 is 11/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 20 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
30/40 = 30 × 1/40 × 1 = 30/40 - Likewise, for the 2nd fraction, since 20 × 2 = 40,
4/20 = 4 × 2/20 × 2 = 8/40 - Subtract the two like fractions:
30/40 - 8/40 = 30 - 8/40 = 22/40 - After reducing the fraction, the answer is 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/40-4/20 30/40-8/20 30/80-4/20 30/40-4/40 90/40-4/20 30/40-12/20 30/40-4/60 30/40-28/20