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Subtract 20/56 from 12/45

12/45 - 20/56 is -19/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 56 is 2520
  2. For the 1st fraction, since 45 × 56 = 2520,
    12/45 = 12 × 56/45 × 56 = 672/2520
  3. Likewise, for the 2nd fraction, since 56 × 45 = 2520,
    20/56 = 20 × 45/56 × 45 = 900/2520
  4. Subtract the two fractions:
    672/2520 - 900/2520 = 672 - 900/2520 = -228/2520
  5. After reducing the fraction, the answer is -19/210

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