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Subtract 63/40 from 15/21

1st number: 15/21, 2nd number: 1 23/40

15/21 - 63/40 is -241/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    15/21 = 15 × 40/21 × 40 = 600/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    63/40 = 63 × 21/40 × 21 = 1323/840
  4. Subtract the two like fractions:
    600/840 - 1323/840 = 600 - 1323/840 = -723/840
  5. After reducing the fraction, the answer is -241/280

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