Subtract 12/21 from 21/75
21/75 - 12/21 is -51/175.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 75 × 7 = 525,
21/75 = 21 × 7/75 × 7 = 147/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
12/21 = 12 × 25/21 × 25 = 300/525 - Subtract the two like fractions:
147/525 - 300/525 = 147 - 300/525 = -153/525 - After reducing the fraction, the answer is -51/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-12/21 21/75-24/21 21/75-12/42 63/75-12/21 21/75-36/21 21/75-12/63 21/75-60/21 21/75-84/21