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Subtract 40/21 from 40/18

1st number: 2 4/18, 2nd number: 1 19/21

40/18 - 40/21 is 20/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126
  2. For the 1st fraction, since 18 × 7 = 126,
    40/18 = 40 × 7/18 × 7 = 280/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    40/21 = 40 × 6/21 × 6 = 240/126
  4. Subtract the two fractions:
    280/126 - 240/126 = 280 - 240/126 = 40/126
  5. After reducing the fraction, the answer is 20/63

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