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Subtract 20/84 from 70/21

1st number: 3 7/21, 2nd number: 20/84

70/21 - 20/84 is 65/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 84 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    70/21 = 70 × 4/21 × 4 = 280/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    20/84 = 20 × 1/84 × 1 = 20/84
  4. Subtract the two fractions:
    280/84 - 20/84 = 280 - 20/84 = 260/84
  5. After reducing the fraction, the answer is 65/21
  6. In mixed form: 32/21

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