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Subtract 21/84 from 30/18

1st number: 1 12/18, 2nd number: 21/84

30/18 - 21/84 is 17/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 84 is 252
  2. For the 1st fraction, since 18 × 14 = 252,
    30/18 = 30 × 14/18 × 14 = 420/252
  3. Likewise, for the 2nd fraction, since 84 × 3 = 252,
    21/84 = 21 × 3/84 × 3 = 63/252
  4. Subtract the two fractions:
    420/252 - 63/252 = 420 - 63/252 = 357/252
  5. After reducing the fraction, the answer is 17/12
  6. In mixed form: 15/12

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