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Subtract 40/28 from 30/42

1st number: 30/42, 2nd number: 1 12/28

30/42 - 40/28 is -5/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 28 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    30/42 = 30 × 2/42 × 2 = 60/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    40/28 = 40 × 3/28 × 3 = 120/84
  4. Subtract the two fractions:
    60/84 - 120/84 = 60 - 120/84 = -60/84
  5. After reducing the fraction, the answer is -5/7

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