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Subtract 84/4 from 1/21

1st number: 1/21, 2nd number: 21 0/4

1/21 - 84/4 is -440/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 4 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    84/4 = 84 × 21/4 × 21 = 1764/84
  4. Subtract the two like fractions:
    4/84 - 1764/84 = 4 - 1764/84 = -1760/84
  5. After reducing the fraction, the answer is -440/21

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