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Subtract 16/45 from 7/20

7/20 - 16/45 is -1/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 45 is 180
  2. For the 1st fraction, since 20 × 9 = 180,
    7/20 = 7 × 9/20 × 9 = 63/180
  3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
    16/45 = 16 × 4/45 × 4 = 64/180
  4. Subtract the two fractions:
    63/180 - 64/180 = 63 - 64/180 = -1/180

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