Subtract 28/4 from 1/21
1st number: 1/21, 2nd number: 7 0/4
1/21 - 28/4 is -146/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
28/4 = 28 × 21/4 × 21 = 588/84 - Subtract the two like fractions:
4/84 - 588/84 = 4 - 588/84 = -584/84 - After reducing the fraction, the answer is -146/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-28/4 1/21-56/4 1/42-28/4 1/21-28/8 3/21-28/4 1/21-84/4 1/63-28/4 1/21-28/12 5/21-28/4 1/21-28/20 7/21-28/4