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Subtract 70/18 from 6/21

1st number: 6/21, 2nd number: 3 16/18

6/21 - 70/18 is -227/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126
  2. For the 1st fraction, since 21 × 6 = 126,
    6/21 = 6 × 6/21 × 6 = 36/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    70/18 = 70 × 7/18 × 7 = 490/126
  4. Subtract the two fractions:
    36/126 - 490/126 = 36 - 490/126 = -454/126
  5. After reducing the fraction, the answer is -227/63

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