Subtract 50/25 from 28/21
1st number: 1 7/21, 2nd number: 2 0/25
28/21 - 50/25 is -2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
28/21 = 28 × 25/21 × 25 = 700/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
50/25 = 50 × 21/25 × 21 = 1050/525 - Subtract the two like fractions:
700/525 - 1050/525 = 700 - 1050/525 = -350/525 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-50/25 28/42-50/25 84/21-50/25 28/63-50/25 28/21-50/75