Subtract 63/20 from 4/21
1st number: 4/21, 2nd number: 3 3/20
4/21 - 63/20 is -1243/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
4/21 = 4 × 20/21 × 20 = 80/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
63/20 = 63 × 21/20 × 21 = 1323/420 - Subtract the two like fractions:
80/420 - 1323/420 = 80 - 1323/420 = -1243/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-63/20 4/42-63/20 4/21-63/40 12/21-63/20 4/63-63/20 4/21-63/60 20/21-63/20 28/21-63/20