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Subtract 5/10 from 3/42

3/42 - 5/10 is -3/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 10 is 210
  2. For the 1st fraction, since 42 × 5 = 210,
    3/42 = 3 × 5/42 × 5 = 15/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    5/10 = 5 × 21/10 × 21 = 105/210
  4. Subtract the two fractions:
    15/210 - 105/210 = 15 - 105/210 = -90/210
  5. After reducing the fraction, the answer is -3/7

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