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Subtract 4/10 from 15/42

15/42 - 4/10 is -3/70.

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,
    15/42 = 15 × 5/42 × 5 = 75/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    4/10 = 4 × 21/10 × 21 = 84/210
  4. Subtract the two fractions:
    75/210 - 84/210 = 75 - 84/210 = -9/210
  5. After reducing the fraction, the answer is -3/70

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