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Subtract 42/90 from 1/8

1/8 - 42/90 is -41/120.

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,
    1/8 = 1 × 45/8 × 45 = 45/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    42/90 = 42 × 4/90 × 4 = 168/360
  4. Subtract the two like fractions:
    45/360 - 168/360 = 45 - 168/360 = -123/360
  5. After reducing the fraction, the answer is -41/120

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