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Subtract 15/18 from 21/10

1st number: 2 1/10, 2nd number: 15/18

21/10 - 15/18 is 19/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 18 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 10 × 9 = 90,
    21/10 = 21 × 9/10 × 9 = 189/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    15/18 = 15 × 5/18 × 5 = 75/90
  4. Subtract the two like fractions:
    189/90 - 75/90 = 189 - 75/90 = 114/90
  5. After reducing the fraction, the answer is 19/15
  6. In mixed form: 14/15

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