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Subtract 4/20 from 1/45

1/45 - 4/20 is -8/45.

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,
    1/45 = 1 × 4/45 × 4 = 4/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    4/20 = 4 × 9/20 × 9 = 36/180
  4. Subtract the two fractions:
    4/180 - 36/180 = 4 - 36/180 = -32/180
  5. After reducing the fraction, the answer is -8/45

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