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Subtract 45/90 from 3/8

3/8 - 45/90 is -1/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 90 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 8 × 45 = 360,
    3/8 = 3 × 45/8 × 45 = 135/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    45/90 = 45 × 4/90 × 4 = 180/360
  4. Subtract the two like fractions:
    135/360 - 180/360 = 135 - 180/360 = -45/360
  5. After reducing the fraction, the answer is -1/8

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