Answers

Subtract 63/81 from 16/70

16/70 - 63/81 is -173/315.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 81 is 5670
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5670
2. For the 1st fraction, since 70 × 81 = 5670,
   16/70 = 16 × 81/70 × 81 = 1296/5670
3. Likewise, for the 2nd fraction, since 81 × 70 = 5670,
   63/81 = 63 × 70/81 × 70 = 4410/5670
4. Subtract the two like fractions:
   1296/5670 - 4410/5670 = 1296 - 4410/5670 = -3114/5670
5. After reducing the fraction, the answer is -173/315

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