Answers

Subtract 63/70 from 4/81

4/81 - 63/70 is -689/810.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 70 is 5670
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5670
2. For the 1st fraction, since 81 × 70 = 5670,
   4/81 = 4 × 70/81 × 70 = 280/5670
3. Likewise, for the 2nd fraction, since 70 × 81 = 5670,
   63/70 = 63 × 81/70 × 81 = 5103/5670
4. Subtract the two like fractions:
   280/5670 - 5103/5670 = 280 - 5103/5670 = -4823/5670
5. After reducing the fraction, the answer is -689/810

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