Subtract 6/7 from 42/63
42/63 - 6/7 is -4/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 7 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Likewise, for the 2nd fraction, since 7 × 9 = 63,
6/7 = 6 × 9/7 × 9 = 54/63 - Subtract the two like fractions:
42/63 - 54/63 = 42 - 54/63 = -12/63 - After reducing the fraction, the answer is -4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/63-6/7 42/63-12/7 42/63-6/14 42/63-18/7 42/63-6/21 42/63-30/7 42/63-6/35 42/63-42/7 42/63-6/49