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Subtract 8/80 from 20/42

20/42 - 8/80 is 79/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    20/42 = 20 × 40/42 × 40 = 800/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    8/80 = 8 × 21/80 × 21 = 168/1680
  4. Subtract the two fractions:
    800/1680 - 168/1680 = 800 - 168/1680 = 632/1680
  5. After reducing the fraction, the answer is 79/210

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