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Subtract 1/72 from 8/21

8/21 - 1/72 is 185/504.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 72 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 21 × 24 = 504,
    8/21 = 8 × 24/21 × 24 = 192/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    1/72 = 1 × 7/72 × 7 = 7/504
  4. Subtract the two like fractions:
    192/504 - 7/504 = 192 - 7/504 = 185/504

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