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Subtract 20/84 from 70/42

1st number: 1 28/42, 2nd number: 20/84

70/42 - 20/84 is 10/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 84 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    70/42 = 70 × 2/42 × 2 = 140/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    20/84 = 20 × 1/84 × 1 = 20/84
  4. Subtract the two fractions:
    140/84 - 20/84 = 140 - 20/84 = 120/84
  5. After reducing the fraction, the answer is 10/7
  6. In mixed form: 13/7

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