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Subtract 18/84 from 63/42

1st number: 1 21/42, 2nd number: 18/84

63/42 - 18/84 is 9/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 84 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    63/42 = 63 × 2/42 × 2 = 126/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    18/84 = 18 × 1/84 × 1 = 18/84
  4. Subtract the two fractions:
    126/84 - 18/84 = 126 - 18/84 = 108/84
  5. After reducing the fraction, the answer is 9/7
  6. In mixed form: 12/7

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