Subtract 2/7 from 18/72
18/72 - 2/7 is -1/28.
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,
18/72 = 18 × 7/72 × 7 = 126/504 - Likewise, for the 2nd fraction, since 7 × 72 = 504,
2/7 = 2 × 72/7 × 72 = 144/504 - Subtract the two like fractions:
126/504 - 144/504 = 126 - 144/504 = -18/504 - After reducing the fraction, the answer is -1/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/72-2/7 18/72-4/7 18/72-2/14 54/72-2/7 18/72-6/7 18/72-2/21 90/72-2/7 18/72-10/7 18/72-2/35 18/72-14/7 18/72-2/49