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Subtract 21/90 from 9/40

9/40 - 21/90 is -1/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 90 is 360
  2. For the 1st fraction, since 40 × 9 = 360,
    9/40 = 9 × 9/40 × 9 = 81/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    21/90 = 21 × 4/90 × 4 = 84/360
  4. Subtract the two fractions:
    81/360 - 84/360 = 81 - 84/360 = -3/360
  5. After reducing the fraction, the answer is -1/120

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