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Subtract 20/21 from 18/2

1st number: 9 0/2, 2nd number: 20/21

18/2 - 20/21 is 169/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 21 is 42
  2. For the 1st fraction, since 2 × 21 = 42,
    18/2 = 18 × 21/2 × 21 = 378/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    20/21 = 20 × 2/21 × 2 = 40/42
  4. Subtract the two fractions:
    378/42 - 40/42 = 378 - 40/42 = 338/42
  5. After reducing the fraction, the answer is 169/21
  6. In mixed form: 81/21

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