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Subtract 6/90 from 21/40

21/40 - 6/90 is 11/24.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 90 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 40 × 9 = 360,
    21/40 = 21 × 9/40 × 9 = 189/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    6/90 = 6 × 4/90 × 4 = 24/360
  4. Subtract the two like fractions:
    189/360 - 24/360 = 189 - 24/360 = 165/360
  5. After reducing the fraction, the answer is 11/24

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