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Subtract 21/5 from 5/2

1st number: 2 1/2, 2nd number: 4 1/5

5/2 - 21/5 is -17/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 5 is 10

    Next, find the equivalent fraction of both fractional numbers with denominator 10
  2. For the 1st fraction, since 2 × 5 = 10,
    5/2 = 5 × 5/2 × 5 = 25/10
  3. Likewise, for the 2nd fraction, since 5 × 2 = 10,
    21/5 = 21 × 2/5 × 2 = 42/10
  4. Subtract the two like fractions:
    25/10 - 42/10 = 25 - 42/10 = -17/10

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