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Subtract 7/10 from 15/42

15/42 - 7/10 is -12/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 10 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 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,
    7/10 = 7 × 21/10 × 21 = 147/210
  4. Subtract the two like fractions:
    75/210 - 147/210 = 75 - 147/210 = -72/210
  5. After reducing the fraction, the answer is -12/35

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