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Subtract 3/9 from 4/7

4/7 - 3/9 is 5/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 7 × 9 = 63,
    4/7 = 4 × 9/7 × 9 = 36/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    3/9 = 3 × 7/9 × 7 = 21/63
  4. Subtract the two like fractions:
    36/63 - 21/63 = 36 - 21/63 = 15/63
  5. After reducing the fraction, the answer is 5/21

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