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Subtract 54/70 from 9/20

9/20 - 54/70 is -9/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 70 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 20 × 7 = 140,
    9/20 = 9 × 7/20 × 7 = 63/140
  3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
    54/70 = 54 × 2/70 × 2 = 108/140
  4. Subtract the two like fractions:
    63/140 - 108/140 = 63 - 108/140 = -45/140
  5. After reducing the fraction, the answer is -9/28

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