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Subtract 1/21 from 18/4

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

18/4 - 1/21 is 187/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 21 is 84
  2. For the 1st fraction, since 4 × 21 = 84,
    18/4 = 18 × 21/4 × 21 = 378/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  4. Subtract the two fractions:
    378/84 - 4/84 = 378 - 4/84 = 374/84
  5. After reducing the fraction, the answer is 187/42
  6. In mixed form: 419/42

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