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Subtract 21/10 from 6/8

1st number: 6/8, 2nd number: 2 1/10

6/8 - 21/10 is -27/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 10 is 40

    Next, find the equivalent fraction of both fractional numbers with denominator 40
  2. For the 1st fraction, since 8 × 5 = 40,
    6/8 = 6 × 5/8 × 5 = 30/40
  3. Likewise, for the 2nd fraction, since 10 × 4 = 40,
    21/10 = 21 × 4/10 × 4 = 84/40
  4. Subtract the two like fractions:
    30/40 - 84/40 = 30 - 84/40 = -54/40
  5. After reducing the fraction, the answer is -27/20

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