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Subtract 2/21 from 7/40

7/40 - 2/21 is 67/840.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 40 × 21 = 840,
    7/40 = 7 × 21/40 × 21 = 147/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    2/21 = 2 × 40/21 × 40 = 80/840
  4. Subtract the two like fractions:
    147/840 - 80/840 = 147 - 80/840 = 67/840

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