Subtract 42/9 from 54/63
1st number: 54/63, 2nd number: 4 6/9
54/63 - 42/9 is -80/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
54/63 = 54 × 1/63 × 1 = 54/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
42/9 = 42 × 7/9 × 7 = 294/63 - Subtract the two like fractions:
54/63 - 294/63 = 54 - 294/63 = -240/63 - After reducing the fraction, the answer is -80/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/63-84/9 54/63-42/18 54/63-42/27 54/63-42/45 54/63-42/63