Subtract 20/42 from 75/72
1st number: 1 3/72, 2nd number: 20/42
75/72 - 20/42 is 95/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 42 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
75/72 = 75 × 7/72 × 7 = 525/504 - Likewise, for the 2nd fraction, since 42 × 12 = 504,
20/42 = 20 × 12/42 × 12 = 240/504 - Subtract the two like fractions:
525/504 - 240/504 = 525 - 240/504 = 285/504 - After reducing the fraction, the answer is 95/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/72-40/42 75/72-20/84 75/72-60/42