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Subtract 9/21 from 18/40

18/40 - 9/21 is 3/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 21 is 840
  2. For the 1st fraction, since 40 × 21 = 840,
    18/40 = 18 × 21/40 × 21 = 378/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    9/21 = 9 × 40/21 × 40 = 360/840
  4. Subtract the two fractions:
    378/840 - 360/840 = 378 - 360/840 = 18/840
  5. After reducing the fraction, the answer is 3/140

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