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Subtract 20/9 from 5/21

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

5/21 - 20/9 is -125/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    5/21 = 5 × 3/21 × 3 = 15/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    20/9 = 20 × 7/9 × 7 = 140/63
  4. Subtract the two like fractions:
    15/63 - 140/63 = 15 - 140/63 = -125/63

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