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Subtract 3/9 from 21/15

1st number: 1 6/15, 2nd number: 3/9

21/15 - 3/9 is 16/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 9 is 45

    Next, find the equivalent fraction of both fractional numbers with denominator 45
  2. For the 1st fraction, since 15 × 3 = 45,
    21/15 = 21 × 3/15 × 3 = 63/45
  3. Likewise, for the 2nd fraction, since 9 × 5 = 45,
    3/9 = 3 × 5/9 × 5 = 15/45
  4. Subtract the two like fractions:
    63/45 - 15/45 = 63 - 15/45 = 48/45
  5. After reducing the fraction, the answer is 16/15
  6. In mixed form: 11/15

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