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Subtract 3/40 from 21/24

21/24 - 3/40 is 4/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 24 and 40 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 24 × 5 = 120,
    21/24 = 21 × 5/24 × 5 = 105/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    3/40 = 3 × 3/40 × 3 = 9/120
  4. Subtract the two like fractions:
    105/120 - 9/120 = 105 - 9/120 = 96/120
  5. After reducing the fraction, the answer is 4/5

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