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Subtract 8/42 from 10/70

10/70 - 8/42 is -1/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 42 is 210
  2. For the 1st fraction, since 70 × 3 = 210,
    10/70 = 10 × 3/70 × 3 = 30/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    8/42 = 8 × 5/42 × 5 = 40/210
  4. Subtract the two fractions:
    30/210 - 40/210 = 30 - 40/210 = -10/210
  5. After reducing the fraction, the answer is -1/21

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