Subtract 54/42 from 4/21
1st number: 4/21, 2nd number: 1 12/42
4/21 - 54/42 is -23/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
4/21 = 4 × 2/21 × 2 = 8/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
54/42 = 54 × 1/42 × 1 = 54/42 - Subtract the two like fractions:
8/42 - 54/42 = 8 - 54/42 = -46/42 - After reducing the fraction, the answer is -23/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-54/42 4/42-54/42 4/21-54/84 12/21-54/42 4/63-54/42 20/21-54/42 28/21-54/42