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Subtract 4/9 from 21/7

1st number: 3 0/7, 2nd number: 4/9

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

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 9 is 63
  2. For the 1st fraction, since 7 × 9 = 63,
    21/7 = 21 × 9/7 × 9 = 189/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    4/9 = 4 × 7/9 × 7 = 28/63
  4. Subtract the two fractions:
    189/63 - 28/63 = 189 - 28/63 = 161/63
  5. After reducing the fraction, the answer is 23/9
  6. In mixed form: 25/9

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