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Subtract 45/40 from 90/84

1st number: 1 6/84, 2nd number: 1 5/40

90/84 - 45/40 is -3/56.

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,
    90/84 = 90 × 10/84 × 10 = 900/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    45/40 = 45 × 21/40 × 21 = 945/840
  4. Subtract the two fractions:
    900/840 - 945/840 = 900 - 945/840 = -45/840
  5. After reducing the fraction, the answer is -3/56

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