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Subtract 9/10 from 5/42

5/42 - 9/10 is -82/105.

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,
    5/42 = 5 × 5/42 × 5 = 25/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    9/10 = 9 × 21/10 × 21 = 189/210
  4. Subtract the two like fractions:
    25/210 - 189/210 = 25 - 189/210 = -164/210
  5. After reducing the fraction, the answer is -82/105

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