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Subtract 21/80 from 2/10

2/10 - 21/80 is -1/16.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 80 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 10 × 8 = 80,
    2/10 = 2 × 8/10 × 8 = 16/80
  3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
    21/80 = 21 × 1/80 × 1 = 21/80
  4. Subtract the two like fractions:
    16/80 - 21/80 = 16 - 21/80 = -5/80
  5. After reducing the fraction, the answer is -1/16

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