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Subtract 21/4 from 18/10

1st number: 1 8/10, 2nd number: 5 1/4

18/10 - 21/4 is -69/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 4 is 20
  2. For the 1st fraction, since 10 × 2 = 20,
    18/10 = 18 × 2/10 × 2 = 36/20
  3. Likewise, for the 2nd fraction, since 4 × 5 = 20,
    21/4 = 21 × 5/4 × 5 = 105/20
  4. Subtract the two fractions:
    36/20 - 105/20 = 36 - 105/20 = -69/20

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