Subtract 3/21 from 4/20
4/20 - 3/21 is 2/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
4/20 = 4 × 21/20 × 21 = 84/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
3/21 = 3 × 20/21 × 20 = 60/420 - Subtract the two like fractions:
84/420 - 60/420 = 84 - 60/420 = 24/420 - After reducing the fraction, the answer is 2/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/20-3/21 4/20-6/21 4/40-3/21 4/20-3/42 12/20-3/21 4/20-9/21 4/60-3/21 4/20-3/63 4/20-15/21 28/20-3/21