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Subtract 21/30 from 2/5

2/5 - 21/30 is -3/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 30 is 30

    Next, find the equivalent fraction of both fractional numbers with denominator 30
  2. For the 1st fraction, since 5 × 6 = 30,
    2/5 = 2 × 6/5 × 6 = 12/30
  3. Likewise, for the 2nd fraction, since 30 × 1 = 30,
    21/30 = 21 × 1/30 × 1 = 21/30
  4. Subtract the two like fractions:
    12/30 - 21/30 = 12 - 21/30 = -9/30
  5. After reducing the fraction, the answer is -3/10

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