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Subtract 1/21 from 9/8

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

9/8 - 1/21 is 181/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 21 is 168
  2. For the 1st fraction, since 8 × 21 = 168,
    9/8 = 9 × 21/8 × 21 = 189/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    1/21 = 1 × 8/21 × 8 = 8/168
  4. Subtract the two fractions:
    189/168 - 8/168 = 189 - 8/168 = 181/168
  5. In mixed form: 113/168

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