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Subtract 63/70 from 20/28

20/28 - 63/70 is -13/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 70 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 28 × 5 = 140,
    20/28 = 20 × 5/28 × 5 = 100/140
  3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
    63/70 = 63 × 2/70 × 2 = 126/140
  4. Subtract the two like fractions:
    100/140 - 126/140 = 100 - 126/140 = -26/140
  5. After reducing the fraction, the answer is -13/70

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