Answers

Subtract 18/81 from 63/70

63/70 - 18/81 is 61/90.

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,
   63/70 = 63 × 81/70 × 81 = 5103/5670
3. Likewise, for the 2nd fraction, since 81 × 70 = 5670,
   18/81 = 18 × 70/81 × 70 = 1260/5670
4. Subtract the two like fractions:
   5103/5670 - 1260/5670 = 5103 - 1260/5670 = 3843/5670
5. After reducing the fraction, the answer is 61/90

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