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Subtract 12/40 from 1/21

1/21 - 12/40 is -53/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    1/21 = 1 × 40/21 × 40 = 40/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    12/40 = 12 × 21/40 × 21 = 252/840
  4. Subtract the two like fractions:
    40/840 - 252/840 = 40 - 252/840 = -212/840
  5. After reducing the fraction, the answer is -53/210

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