Subtract 28/6 from 42/21
1st number: 2 0/21, 2nd number: 4 4/6
42/21 - 28/6 is -8/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
42/21 = 42 × 2/21 × 2 = 84/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
28/6 = 28 × 7/6 × 7 = 196/42 - Subtract the two like fractions:
84/42 - 196/42 = 84 - 196/42 = -112/42 - After reducing the fraction, the answer is -8/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-28/6 42/21-56/6 42/21-28/12 42/21-84/6 42/63-28/6 42/21-28/18 42/21-28/30 42/21-28/42