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Subtract 6/18 from 72/21

1st number: 3 9/21, 2nd number: 6/18

72/21 - 6/18 is 65/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126
  2. For the 1st fraction, since 21 × 6 = 126,
    72/21 = 72 × 6/21 × 6 = 432/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    6/18 = 6 × 7/18 × 7 = 42/126
  4. Subtract the two fractions:
    432/126 - 42/126 = 432 - 42/126 = 390/126
  5. After reducing the fraction, the answer is 65/21
  6. In mixed form: 32/21

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