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Subtract 7/90 from 42/84

42/84 - 7/90 is 19/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 90 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    42/84 = 42 × 15/84 × 15 = 630/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    7/90 = 7 × 14/90 × 14 = 98/1260
  4. Subtract the two like fractions:
    630/1260 - 98/1260 = 630 - 98/1260 = 532/1260
  5. After reducing the fraction, the answer is 19/45

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