Subtract 12/21 from 25/20
1st number: 1 5/20, 2nd number: 12/21
25/20 - 12/21 is 19/28.
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,
25/20 = 25 × 21/20 × 21 = 525/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
12/21 = 12 × 20/21 × 20 = 240/420 - Subtract the two like fractions:
525/420 - 240/420 = 525 - 240/420 = 285/420 - After reducing the fraction, the answer is 19/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/20-12/21 25/20-24/21 25/40-12/21 25/20-12/42 75/20-12/21 25/20-36/21 25/60-12/21 25/20-12/63 25/20-60/21 25/20-84/21