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Subtract 8/10 from 21/42

21/42 - 8/10 is -3/10.

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,
    21/42 = 21 × 5/42 × 5 = 105/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    8/10 = 8 × 21/10 × 21 = 168/210
  4. Subtract the two like fractions:
    105/210 - 168/210 = 105 - 168/210 = -63/210
  5. After reducing the fraction, the answer is -3/10

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