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Subtract 2/45 from 21/18

1st number: 1 3/18, 2nd number: 2/45

21/18 - 2/45 is 101/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 45 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 18 × 5 = 90,
    21/18 = 21 × 5/18 × 5 = 105/90
  3. Likewise, for the 2nd fraction, since 45 × 2 = 90,
    2/45 = 2 × 2/45 × 2 = 4/90
  4. Subtract the two like fractions:
    105/90 - 4/90 = 105 - 4/90 = 101/90
  5. In mixed form: 111/90

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