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Subtract 27/21 from 9/4

1st number: 2 1/4, 2nd number: 1 6/21

9/4 - 27/21 is 27/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 21 is 84
  2. For the 1st fraction, since 4 × 21 = 84,
    9/4 = 9 × 21/4 × 21 = 189/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    27/21 = 27 × 4/21 × 4 = 108/84
  4. Subtract the two fractions:
    189/84 - 108/84 = 189 - 108/84 = 81/84
  5. After reducing the fraction, the answer is 27/28

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