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Subtract 5/20 from 30/21

1st number: 1 9/21, 2nd number: 5/20

30/21 - 5/20 is 33/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    30/21 = 30 × 20/21 × 20 = 600/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    5/20 = 5 × 21/20 × 21 = 105/420
  4. Subtract the two like fractions:
    600/420 - 105/420 = 600 - 105/420 = 495/420
  5. After reducing the fraction, the answer is 33/28
  6. In mixed form: 15/28

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