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Subtract 9/10 from 4/90

4/90 - 9/10 is -77/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 10 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 90 × 1 = 90,
    4/90 = 4 × 1/90 × 1 = 4/90
  3. Likewise, for the 2nd fraction, since 10 × 9 = 90,
    9/10 = 9 × 9/10 × 9 = 81/90
  4. Subtract the two like fractions:
    4/90 - 81/90 = 4 - 81/90 = -77/90

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