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Subtract 84/18 from 21/7

1st number: 3 0/7, 2nd number: 4 12/18

21/7 - 84/18 is -5/3.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 18 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 7 × 18 = 126,
    21/7 = 21 × 18/7 × 18 = 378/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    84/18 = 84 × 7/18 × 7 = 588/126
  4. Subtract the two like fractions:
    378/126 - 588/126 = 378 - 588/126 = -210/126
  5. After reducing the fraction, the answer is -5/3

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