Subtract 63/54 from 15/42
1st number: 15/42, 2nd number: 1 9/54
15/42 - 63/54 is -17/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
15/42 = 15 × 9/42 × 9 = 135/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
63/54 = 63 × 7/54 × 7 = 441/378 - Subtract the two like fractions:
135/378 - 441/378 = 135 - 441/378 = -306/378 - After reducing the fraction, the answer is -17/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-63/54 15/84-63/54 45/42-63/54 75/42-63/54