Subtract 40/21 from 15/72
1st number: 15/72, 2nd number: 1 19/21
15/72 - 40/21 is -95/56.
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,
15/72 = 15 × 7/72 × 7 = 105/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
40/21 = 40 × 24/21 × 24 = 960/504 - Subtract the two like fractions:
105/504 - 960/504 = 105 - 960/504 = -855/504 - After reducing the fraction, the answer is -95/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/72-40/21 15/72-80/21 15/72-40/42 45/72-40/21 15/72-40/63 75/72-40/21