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Subtract 18/24 from 42/70

42/70 - 18/24 is -3/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 24 is 840
  2. For the 1st fraction, since 70 × 12 = 840,
    42/70 = 42 × 12/70 × 12 = 504/840
  3. Likewise, for the 2nd fraction, since 24 × 35 = 840,
    18/24 = 18 × 35/24 × 35 = 630/840
  4. Subtract the two fractions:
    504/840 - 630/840 = 504 - 630/840 = -126/840
  5. After reducing the fraction, the answer is -3/20

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