Subtract 25/21 from 3/20
1st number: 3/20, 2nd number: 1 4/21
3/20 - 25/21 is -437/420.
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,
3/20 = 3 × 21/20 × 21 = 63/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
25/21 = 25 × 20/21 × 20 = 500/420 - Subtract the two like fractions:
63/420 - 500/420 = 63 - 500/420 = -437/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20-25/21 3/20-50/21 3/40-25/21 3/20-25/42 9/20-25/21 3/20-75/21 3/60-25/21 3/20-25/63 15/20-25/21 21/20-25/21