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Subtract 98/9 from 9/21

1st number: 9/21, 2nd number: 10 8/9

9/21 - 98/9 is -659/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    9/21 = 9 × 3/21 × 3 = 27/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    98/9 = 98 × 7/9 × 7 = 686/63
  4. Subtract the two fractions:
    27/63 - 686/63 = 27 - 686/63 = -659/63

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