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Subtract 70/40 from 28/84

1st number: 28/84, 2nd number: 1 30/40

28/84 - 70/40 is -17/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    28/84 = 28 × 10/84 × 10 = 280/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    70/40 = 70 × 21/40 × 21 = 1470/840
  4. Subtract the two fractions:
    280/840 - 1470/840 = 280 - 1470/840 = -1190/840
  5. After reducing the fraction, the answer is -17/12

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