Subtract 40/21 from 8/72
1st number: 8/72, 2nd number: 1 19/21
8/72 - 40/21 is -113/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
8/72 = 8 × 7/72 × 7 = 56/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
40/21 = 40 × 24/21 × 24 = 960/504 - Subtract the two like fractions:
56/504 - 960/504 = 56 - 960/504 = -904/504 - After reducing the fraction, the answer is -113/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/72-40/21 8/72-80/21 8/72-40/42 24/72-40/21 8/72-40/63 40/72-40/21 56/72-40/21