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Subtract 2/20 from 4/45

4/45 - 2/20 is -1/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 20 is 180
  2. For the 1st fraction, since 45 × 4 = 180,
    4/45 = 4 × 4/45 × 4 = 16/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    2/20 = 2 × 9/20 × 9 = 18/180
  4. Subtract the two fractions:
    16/180 - 18/180 = 16 - 18/180 = -2/180
  5. After reducing the fraction, the answer is -1/90

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