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Subtract 5/20 from 42/84

42/84 - 5/20 is 1/4.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 20 is 420
  2. For the 1st fraction, since 84 × 5 = 420,
    42/84 = 42 × 5/84 × 5 = 210/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    5/20 = 5 × 21/20 × 21 = 105/420
  4. Subtract the two fractions:
    210/420 - 105/420 = 210 - 105/420 = 105/420
  5. After reducing the fraction, the answer is 1/4

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