Subtract 75/28 from 42/21
1st number: 2 0/21, 2nd number: 2 19/28
42/21 - 75/28 is -19/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
42/21 = 42 × 4/21 × 4 = 168/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
75/28 = 75 × 3/28 × 3 = 225/84 - Subtract the two like fractions:
168/84 - 225/84 = 168 - 225/84 = -57/84 - 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: 84/21-75/28 42/21-75/56 42/63-75/28 42/21-75/84