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Subtract 3/30 from 21/40

21/40 - 3/30 is 17/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 30 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 40 × 3 = 120,
    21/40 = 21 × 3/40 × 3 = 63/120
  3. Likewise, for the 2nd fraction, since 30 × 4 = 120,
    3/30 = 3 × 4/30 × 4 = 12/120
  4. Subtract the two like fractions:
    63/120 - 12/120 = 63 - 12/120 = 51/120
  5. After reducing the fraction, the answer is 17/40

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