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Subtract 81/30 from 16/8

1st number: 2 0/8, 2nd number: 2 21/30

16/8 - 81/30 is -7/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 30 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 8 × 15 = 120,
    16/8 = 16 × 15/8 × 15 = 240/120
  3. Likewise, for the 2nd fraction, since 30 × 4 = 120,
    81/30 = 81 × 4/30 × 4 = 324/120
  4. Subtract the two like fractions:
    240/120 - 324/120 = 240 - 324/120 = -84/120
  5. After reducing the fraction, the answer is -7/10

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