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Subtract 9/8 from 10/21

1st number: 10/21, 2nd number: 1 1/8

10/21 - 9/8 is -109/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    10/21 = 10 × 8/21 × 8 = 80/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    9/8 = 9 × 21/8 × 21 = 189/168
  4. Subtract the two fractions:
    80/168 - 189/168 = 80 - 189/168 = -109/168

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