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Subtract 18/10 from 8/21

1st number: 8/21, 2nd number: 1 8/10

8/21 - 18/10 is -149/105.

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,
    8/21 = 8 × 10/21 × 10 = 80/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    18/10 = 18 × 21/10 × 21 = 378/210
  4. Subtract the two like fractions:
    80/210 - 378/210 = 80 - 378/210 = -298/210
  5. After reducing the fraction, the answer is -149/105

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