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Subtract 40/42 from 70/21

1st number: 3 7/21, 2nd number: 40/42

70/21 - 40/42 is 50/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 42 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    70/21 = 70 × 2/21 × 2 = 140/42
  3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
    40/42 = 40 × 1/42 × 1 = 40/42
  4. Subtract the two like fractions:
    140/42 - 40/42 = 140 - 40/42 = 100/42
  5. After reducing the fraction, the answer is 50/21
  6. In mixed form: 28/21

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