Subtract 42/72 from 8/63
8/63 - 42/72 is -115/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 63 × 8 = 504,
8/63 = 8 × 8/63 × 8 = 64/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
42/72 = 42 × 7/72 × 7 = 294/504 - Subtract the two like fractions:
64/504 - 294/504 = 64 - 294/504 = -230/504 - After reducing the fraction, the answer is -115/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/63-42/72 8/63-84/72 24/63-42/72 40/63-42/72 56/63-42/72