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Subtract 10/20 from 2/21

2/21 - 10/20 is -17/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    2/21 = 2 × 20/21 × 20 = 40/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    10/20 = 10 × 21/20 × 21 = 210/420
  4. Subtract the two like fractions:
    40/420 - 210/420 = 40 - 210/420 = -170/420
  5. After reducing the fraction, the answer is -17/42

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