Subtract 54/7 from 42/9
1st number: 4 6/9, 2nd number: 7 5/7
42/9 - 54/7 is -64/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 7 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
42/9 = 42 × 7/9 × 7 = 294/63 - Likewise, for the 2nd fraction, since 7 × 9 = 63,
54/7 = 54 × 9/7 × 9 = 486/63 - Subtract the two like fractions:
294/63 - 486/63 = 294 - 486/63 = -192/63 - After reducing the fraction, the answer is -64/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/9-54/7 42/18-54/7 42/9-54/14 42/27-54/7 42/9-54/21 42/45-54/7 42/9-54/35 42/63-54/7 42/9-54/49