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Subtract 40/49 from 21/18

1st number: 1 3/18, 2nd number: 40/49

21/18 - 40/49 is 103/294.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 49 is 882
  2. For the 1st fraction, since 18 × 49 = 882,
    21/18 = 21 × 49/18 × 49 = 1029/882
  3. Likewise, for the 2nd fraction, since 49 × 18 = 882,
    40/49 = 40 × 18/49 × 18 = 720/882
  4. Subtract the two fractions:
    1029/882 - 720/882 = 1029 - 720/882 = 309/882
  5. After reducing the fraction, the answer is 103/294

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