Subtract 8/4 from 9/21
1st number: 9/21, 2nd number: 2 0/4
9/21 - 8/4 is -11/7.
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,
9/21 = 9 × 4/21 × 4 = 36/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
8/4 = 8 × 21/4 × 21 = 168/84 - Subtract the two like fractions:
36/84 - 168/84 = 36 - 168/84 = -132/84 - After reducing the fraction, the answer is -11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-8/4 9/21-16/4 9/42-8/4 27/21-8/4 9/21-24/4 9/63-8/4 9/21-8/12 45/21-8/4 9/21-40/4 9/21-8/20 63/21-8/4 9/21-56/4 9/21-8/28