Subtract 12/42 from 21/75
21/75 - 12/42 is -1/175.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 42 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 75 × 14 = 1050,
21/75 = 21 × 14/75 × 14 = 294/1050 - Likewise, for the 2nd fraction, since 42 × 25 = 1050,
12/42 = 12 × 25/42 × 25 = 300/1050 - Subtract the two like fractions:
294/1050 - 300/1050 = 294 - 300/1050 = -6/1050 - After reducing the fraction, the answer is -1/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-12/42 21/75-24/42 21/75-12/84 63/75-12/42 21/75-36/42 21/75-60/42 21/75-84/42