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Subtract 18/72 from 5/7

5/7 - 18/72 is 13/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 72 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 7 × 72 = 504,
    5/7 = 5 × 72/7 × 72 = 360/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    18/72 = 18 × 7/72 × 7 = 126/504
  4. Subtract the two like fractions:
    360/504 - 126/504 = 360 - 126/504 = 234/504
  5. After reducing the fraction, the answer is 13/28

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