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Subtract 7/21 from 9/4

1st number: 2 1/4, 2nd number: 7/21

9/4 - 7/21 is 23/12.

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,
    7/21 = 7 × 4/21 × 4 = 28/84
  4. Subtract the two fractions:
    189/84 - 28/84 = 189 - 28/84 = 161/84
  5. After reducing the fraction, the answer is 23/12
  6. In mixed form: 111/12

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