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Subtract 15/9 from 72/21

1st number: 3 9/21, 2nd number: 1 6/9

72/21 - 15/9 is 37/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    72/21 = 72 × 3/21 × 3 = 216/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    15/9 = 15 × 7/9 × 7 = 105/63
  4. Subtract the two like fractions:
    216/63 - 105/63 = 216 - 105/63 = 111/63
  5. After reducing the fraction, the answer is 37/21
  6. In mixed form: 116/21

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