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Subtract 1/18 from 21/5

1st number: 4 1/5, 2nd number: 1/18

21/5 - 1/18 is 373/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 18 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 5 × 18 = 90,
    21/5 = 21 × 18/5 × 18 = 378/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    1/18 = 1 × 5/18 × 5 = 5/90
  4. Subtract the two like fractions:
    378/90 - 5/90 = 378 - 5/90 = 373/90
  5. In mixed form: 413/90

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