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Subtract 21/9 from 9/40

1st number: 9/40, 2nd number: 2 3/9

9/40 - 21/9 is -253/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 9 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 9 × 40 = 360,
    21/9 = 21 × 40/9 × 40 = 840/360
  4. Subtract the two fractions:
    81/360 - 840/360 = 81 - 840/360 = -759/360
  5. After reducing the fraction, the answer is -253/120

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