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Subtract 1/21 from 9/40

9/40 - 1/21 is 149/840.

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,
    9/40 = 9 × 21/40 × 21 = 189/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    1/21 = 1 × 40/21 × 40 = 40/840
  4. Subtract the two like fractions:
    189/840 - 40/840 = 189 - 40/840 = 149/840

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