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Subtract 5/40 from 21/84

21/84 - 5/40 is 1/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    21/84 = 21 × 10/84 × 10 = 210/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    5/40 = 5 × 21/40 × 21 = 105/840
  4. Subtract the two fractions:
    210/840 - 105/840 = 210 - 105/840 = 105/840
  5. After reducing the fraction, the answer is 1/8

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