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Subtract 1/20 from 2/42

2/42 - 1/20 is -1/420.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    2/42 = 2 × 10/42 × 10 = 20/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    1/20 = 1 × 21/20 × 21 = 21/420
  4. Subtract the two fractions:
    20/420 - 21/420 = 20 - 21/420 = -1/420

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