Subtract 42/63 from 3/7
3/7 - 42/63 is -5/21.
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,
3/7 = 3 × 9/7 × 9 = 27/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Subtract the two like fractions:
27/63 - 42/63 = 27 - 42/63 = -15/63 - After reducing the fraction, the answer is -5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-42/63 3/7-84/63 3/14-42/63 9/7-42/63 3/21-42/63 15/7-42/63 3/35-42/63 21/7-42/63 3/49-42/63