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Subtract 1/20 from 21/84

21/84 - 1/20 is 1/5.

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,
    21/84 = 21 × 5/84 × 5 = 105/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    1/20 = 1 × 21/20 × 21 = 21/420
  4. Subtract the two fractions:
    105/420 - 21/420 = 105 - 21/420 = 84/420
  5. After reducing the fraction, the answer is 1/5

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