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Subtract 42/84 from 1/45

1/45 - 42/84 is -43/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 84 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 45 × 28 = 1260,
    1/45 = 1 × 28/45 × 28 = 28/1260
  3. Likewise, for the 2nd fraction, since 84 × 15 = 1260,
    42/84 = 42 × 15/84 × 15 = 630/1260
  4. Subtract the two like fractions:
    28/1260 - 630/1260 = 28 - 630/1260 = -602/1260
  5. After reducing the fraction, the answer is -43/90

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