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Subtract 21/10 from 8/45

1st number: 8/45, 2nd number: 2 1/10

8/45 - 21/10 is -173/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 10 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 45 × 2 = 90,
    8/45 = 8 × 2/45 × 2 = 16/90
  3. Likewise, for the 2nd fraction, since 10 × 9 = 90,
    21/10 = 21 × 9/10 × 9 = 189/90
  4. Subtract the two like fractions:
    16/90 - 189/90 = 16 - 189/90 = -173/90

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