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Subtract 18/21 from 18/8

1st number: 2 2/8, 2nd number: 18/21

18/8 - 18/21 is 39/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 21 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 8 × 21 = 168,
    18/8 = 18 × 21/8 × 21 = 378/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    18/21 = 18 × 8/21 × 8 = 144/168
  4. Subtract the two like fractions:
    378/168 - 144/168 = 378 - 144/168 = 234/168
  5. After reducing the fraction, the answer is 39/28
  6. In mixed form: 111/28

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