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Subtract 9/8 from 21/35

1st number: 21/35, 2nd number: 1 1/8

21/35 - 9/8 is -21/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 8 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 8 × 35 = 280,
    9/8 = 9 × 35/8 × 35 = 315/280
  4. Subtract the two like fractions:
    168/280 - 315/280 = 168 - 315/280 = -147/280
  5. After reducing the fraction, the answer is -21/40

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