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Subtract 18/21 from 1/42

1/42 - 18/21 is -5/6.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 21 is 42
  2. For the 1st fraction, since 42 × 1 = 42,
    1/42 = 1 × 1/42 × 1 = 1/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    18/21 = 18 × 2/21 × 2 = 36/42
  4. Subtract the two fractions:
    1/42 - 36/42 = 1 - 36/42 = -35/42
  5. After reducing the fraction, the answer is -5/6

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