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Subtract 18/27 from 72/21

1st number: 3 9/21, 2nd number: 18/27

72/21 - 18/27 is 58/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 27 is 189
  2. For the 1st fraction, since 21 × 9 = 189,
    72/21 = 72 × 9/21 × 9 = 648/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    18/27 = 18 × 7/27 × 7 = 126/189
  4. Subtract the two fractions:
    648/189 - 126/189 = 648 - 126/189 = 522/189
  5. After reducing the fraction, the answer is 58/21
  6. In mixed form: 216/21

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