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Subtract 9/40 from 5/21

5/21 - 9/40 is 11/840.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    5/21 = 5 × 40/21 × 40 = 200/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    9/40 = 9 × 21/40 × 21 = 189/840
  4. Subtract the two fractions:
    200/840 - 189/840 = 200 - 189/840 = 11/840

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