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Subtract 9/16 from 20/45

20/45 - 9/16 is -17/144.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 16 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 45 × 16 = 720,
    20/45 = 20 × 16/45 × 16 = 320/720
  3. Likewise, for the 2nd fraction, since 16 × 45 = 720,
    9/16 = 9 × 45/16 × 45 = 405/720
  4. Subtract the two like fractions:
    320/720 - 405/720 = 320 - 405/720 = -85/720
  5. After reducing the fraction, the answer is -17/144

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