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Subtract 63/40 from 21/35

1st number: 21/35, 2nd number: 1 23/40

21/35 - 63/40 is -39/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 40 is 280

    Next, find the equivalent fraction of both fractional numbers with denominator 280
  2. For the 1st fraction, since 35 × 8 = 280,
    21/35 = 21 × 8/35 × 8 = 168/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    63/40 = 63 × 7/40 × 7 = 441/280
  4. Subtract the two like fractions:
    168/280 - 441/280 = 168 - 441/280 = -273/280
  5. After reducing the fraction, the answer is -39/40

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