Answers

Subtract 70/21 from 12/84

1^st number: 12/84, 2^nd number: 3 7/21

12/84 - 70/21 is -67/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 21 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 84 × 1 = 84,
   12/84 = 12 × 1/84 × 1 = 12/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   70/21 = 70 × 4/21 × 4 = 280/84
4. Subtract the two like fractions:
   12/84 - 280/84 = 12 - 280/84 = -268/84
5. After reducing the fraction, the answer is -67/21

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