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Subtract 40/6 from 54/21

1st number: 2 12/21, 2nd number: 6 4/6

54/21 - 40/6 is -86/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 6 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    54/21 = 54 × 2/21 × 2 = 108/42
  3. Likewise, for the 2nd fraction, since 6 × 7 = 42,
    40/6 = 40 × 7/6 × 7 = 280/42
  4. Subtract the two like fractions:
    108/42 - 280/42 = 108 - 280/42 = -172/42
  5. After reducing the fraction, the answer is -86/21

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