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Subtract 21/6 from 20/90

1st number: 20/90, 2nd number: 3 3/6

20/90 - 21/6 is -59/18.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 6 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 90 × 1 = 90,
    20/90 = 20 × 1/90 × 1 = 20/90
  3. Likewise, for the 2nd fraction, since 6 × 15 = 90,
    21/6 = 21 × 15/6 × 15 = 315/90
  4. Subtract the two like fractions:
    20/90 - 315/90 = 20 - 315/90 = -295/90
  5. After reducing the fraction, the answer is -59/18

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