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Subtract 21/42 from 8/9

8/9 - 21/42 is 7/18.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 42 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 9 × 14 = 126,
    8/9 = 8 × 14/9 × 14 = 112/126
  3. Likewise, for the 2nd fraction, since 42 × 3 = 126,
    21/42 = 21 × 3/42 × 3 = 63/126
  4. Subtract the two like fractions:
    112/126 - 63/126 = 112 - 63/126 = 49/126
  5. After reducing the fraction, the answer is 7/18

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