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Subtract 42/45 from 4/9

4/9 - 42/45 is -22/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 45 is 45
  2. For the 1st fraction, since 9 × 5 = 45,
    4/9 = 4 × 5/9 × 5 = 20/45
  3. Likewise, for the 2nd fraction, since 45 × 1 = 45,
    42/45 = 42 × 1/45 × 1 = 42/45
  4. Subtract the two fractions:
    20/45 - 42/45 = 20 - 42/45 = -22/45

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