Subtract 42/63 from 8/7
1st number: 1 1/7, 2nd number: 42/63
8/7 - 42/63 is 10/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
8/7 = 8 × 9/7 × 9 = 72/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Subtract the two like fractions:
72/63 - 42/63 = 72 - 42/63 = 30/63 - After reducing the fraction, the answer is 10/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-42/63 8/7-84/63 8/14-42/63 24/7-42/63 8/21-42/63 40/7-42/63 8/35-42/63 56/7-42/63 8/49-42/63