Subtract 54/21 from 8/4
1st number: 2 0/4, 2nd number: 2 12/21
8/4 - 54/21 is -4/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
8/4 = 8 × 21/4 × 21 = 168/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
54/21 = 54 × 4/21 × 4 = 216/84 - Subtract the two like fractions:
168/84 - 216/84 = 168 - 216/84 = -48/84 - After reducing the fraction, the answer is -4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/4-54/21 8/4-54/42 24/4-54/21 8/12-54/21 8/4-54/63 40/4-54/21 8/20-54/21 56/4-54/21 8/28-54/21