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Subtract 21/9 from 63/40

1st number: 1 23/40, 2nd number: 2 3/9

63/40 - 21/9 is -91/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 9 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 40 × 9 = 360,
    63/40 = 63 × 9/40 × 9 = 567/360
  3. Likewise, for the 2nd fraction, since 9 × 40 = 360,
    21/9 = 21 × 40/9 × 40 = 840/360
  4. Subtract the two like fractions:
    567/360 - 840/360 = 567 - 840/360 = -273/360
  5. After reducing the fraction, the answer is -91/120

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