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Subtract 10/5 from 21/15

1st number: 1 6/15, 2nd number: 2 0/5

21/15 - 10/5 is -3/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 5 is 15

    Next, find the equivalent fraction of both fractional numbers with denominator 15
  2. For the 1st fraction, since 15 × 1 = 15,
    21/15 = 21 × 1/15 × 1 = 21/15
  3. Likewise, for the 2nd fraction, since 5 × 3 = 15,
    10/5 = 10 × 3/5 × 3 = 30/15
  4. Subtract the two like fractions:
    21/15 - 30/15 = 21 - 30/15 = -9/15
  5. After reducing the fraction, the answer is -3/5

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