Subtract 80/7 from 40/72
1st number: 40/72, 2nd number: 11 3/7
40/72 - 80/7 is -685/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 7 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
40/72 = 40 × 7/72 × 7 = 280/504 - Likewise, for the 2nd fraction, since 7 × 72 = 504,
80/7 = 80 × 72/7 × 72 = 5760/504 - Subtract the two like fractions:
280/504 - 5760/504 = 280 - 5760/504 = -5480/504 - After reducing the fraction, the answer is -685/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/72-80/7 40/72-80/14 40/72-80/21 40/72-80/35 40/72-80/49