Subtract 21/25 from 12/28
12/28 - 21/25 is -72/175.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 25 is 700
Next, find the equivalent fraction of both fractional numbers with denominator 700 - For the 1st fraction, since 28 × 25 = 700,
12/28 = 12 × 25/28 × 25 = 300/700 - Likewise, for the 2nd fraction, since 25 × 28 = 700,
21/25 = 21 × 28/25 × 28 = 588/700 - Subtract the two like fractions:
300/700 - 588/700 = 300 - 588/700 = -288/700 - After reducing the fraction, the answer is -72/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28-21/25 12/28-42/25 12/56-21/25 12/28-21/50 36/28-21/25 12/28-63/25 12/84-21/25 12/28-21/75 60/28-21/25 84/28-21/25