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Subtract 84/7 from 5/21

1st number: 5/21, 2nd number: 12 0/7

5/21 - 84/7 is -247/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21

    Next, find the equivalent fraction of both fractional numbers with denominator 21
  2. For the 1st fraction, since 21 × 1 = 21,
    5/21 = 5 × 1/21 × 1 = 5/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    84/7 = 84 × 3/7 × 3 = 252/21
  4. Subtract the two like fractions:
    5/21 - 252/21 = 5 - 252/21 = -247/21

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