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Subtract 21/20 from 4/36

1st number: 4/36, 2nd number: 1 1/20

4/36 - 21/20 is -169/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 20 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 36 × 5 = 180,
    4/36 = 4 × 5/36 × 5 = 20/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    21/20 = 21 × 9/20 × 9 = 189/180
  4. Subtract the two like fractions:
    20/180 - 189/180 = 20 - 189/180 = -169/180

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