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Subtract 21/16 from 10/18

1st number: 10/18, 2nd number: 1 5/16

10/18 - 21/16 is -109/144.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 16 is 144

    Next, find the equivalent fraction of both fractional numbers with denominator 144
  2. For the 1st fraction, since 18 × 8 = 144,
    10/18 = 10 × 8/18 × 8 = 80/144
  3. Likewise, for the 2nd fraction, since 16 × 9 = 144,
    21/16 = 21 × 9/16 × 9 = 189/144
  4. Subtract the two like fractions:
    80/144 - 189/144 = 80 - 189/144 = -109/144

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