Subtract 42/21 from 5/6
1st number: 5/6, 2nd number: 2 0/21
5/6 - 42/21 is -7/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
5/6 = 5 × 7/6 × 7 = 35/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
42/21 = 42 × 2/21 × 2 = 84/42 - Subtract the two like fractions:
35/42 - 84/42 = 35 - 84/42 = -49/42 - After reducing the fraction, the answer is -7/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/6-42/21 5/6-84/21 5/12-42/21 15/6-42/21 5/18-42/21 5/6-42/63 25/6-42/21 5/30-42/21 35/6-42/21 5/42-42/21