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Subtract 40/84 from 30/21

1st number: 1 9/21, 2nd number: 40/84

30/21 - 40/84 is 20/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 84 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    30/21 = 30 × 4/21 × 4 = 120/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    40/84 = 40 × 1/84 × 1 = 40/84
  4. Subtract the two like fractions:
    120/84 - 40/84 = 120 - 40/84 = 80/84
  5. After reducing the fraction, the answer is 20/21

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