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Subtract 21/10 from 20/9

1st number: 2 2/9, 2nd number: 2 1/10

20/9 - 21/10 is 11/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 10 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 9 × 10 = 90,
    20/9 = 20 × 10/9 × 10 = 200/90
  3. Likewise, for the 2nd fraction, since 10 × 9 = 90,
    21/10 = 21 × 9/10 × 9 = 189/90
  4. Subtract the two like fractions:
    200/90 - 189/90 = 200 - 189/90 = 11/90

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