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Subtract 12/10 from 8/42

1st number: 8/42, 2nd number: 1 2/10

8/42 - 12/10 is -106/105.

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,
    8/42 = 8 × 5/42 × 5 = 40/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    12/10 = 12 × 21/10 × 21 = 252/210
  4. Subtract the two fractions:
    40/210 - 252/210 = 40 - 252/210 = -212/210
  5. After reducing the fraction, the answer is -106/105

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