Subtract 1/72 from 3/42
3/42 - 1/72 is 29/504.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
3/42 = 3 × 12/42 × 12 = 36/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
1/72 = 1 × 7/72 × 7 = 7/504 - Subtract the two like fractions:
36/504 - 7/504 = 36 - 7/504 = 29/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42-1/72 3/42-2/72 3/84-1/72 9/42-1/72 3/42-3/72 15/42-1/72 3/42-5/72 21/42-1/72 3/42-7/72