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Subtract 21/40 from 18/49

18/49 - 21/40 is -309/1960.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 49 and 40 is 1960
  2. For the 1st fraction, since 49 × 40 = 1960,
    18/49 = 18 × 40/49 × 40 = 720/1960
  3. Likewise, for the 2nd fraction, since 40 × 49 = 1960,
    21/40 = 21 × 49/40 × 49 = 1029/1960
  4. Subtract the two fractions:
    720/1960 - 1029/1960 = 720 - 1029/1960 = -309/1960

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