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Subtract 30/21 from 1/2

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

1/2 - 30/21 is -13/14.

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,
    1/2 = 1 × 21/2 × 21 = 21/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    30/21 = 30 × 2/21 × 2 = 60/42
  4. Subtract the two fractions:
    21/42 - 60/42 = 21 - 60/42 = -39/42
  5. After reducing the fraction, the answer is -13/14

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