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Subtract 42/90 from 25/84

25/84 - 42/90 is -71/420.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 90 is 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    25/84 = 25 × 15/84 × 15 = 375/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    42/90 = 42 × 14/90 × 14 = 588/1260
  4. Subtract the two fractions:
    375/1260 - 588/1260 = 375 - 588/1260 = -213/1260
  5. After reducing the fraction, the answer is -71/420

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