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Subtract 30/50 from 10/21

10/21 - 30/50 is -13/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 50 is 1050

    Next, find the equivalent fraction of both fractional numbers with denominator 1050
  2. For the 1st fraction, since 21 × 50 = 1050,
    10/21 = 10 × 50/21 × 50 = 500/1050
  3. Likewise, for the 2nd fraction, since 50 × 21 = 1050,
    30/50 = 30 × 21/50 × 21 = 630/1050
  4. Subtract the two like fractions:
    500/1050 - 630/1050 = 500 - 630/1050 = -130/1050
  5. After reducing the fraction, the answer is -13/105

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