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Subtract 18/21 from 90/8

1st number: 11 2/8, 2nd number: 18/21

90/8 - 18/21 is 291/28.

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,
    90/8 = 90 × 21/8 × 21 = 1890/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    18/21 = 18 × 8/21 × 8 = 144/168
  4. Subtract the two like fractions:
    1890/168 - 144/168 = 1890 - 144/168 = 1746/168
  5. After reducing the fraction, the answer is 291/28
  6. In mixed form: 1011/28

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