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Subtract 15/10 from 7/21

1st number: 7/21, 2nd number: 1 5/10

7/21 - 15/10 is -7/6.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 10 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 21 × 10 = 210,
    7/21 = 7 × 10/21 × 10 = 70/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    15/10 = 15 × 21/10 × 21 = 315/210
  4. Subtract the two like fractions:
    70/210 - 315/210 = 70 - 315/210 = -245/210
  5. After reducing the fraction, the answer is -7/6

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