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Subtract 42/21 from 1/42

1st number: 1/42, 2nd number: 2 0/21

1/42 - 42/21 is -83/42.

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,
    42/21 = 42 × 2/21 × 2 = 84/42
  4. Subtract the two fractions:
    1/42 - 84/42 = 1 - 84/42 = -83/42

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