Answers

Subtract 30/63 from 18/81

18/81 - 30/63 is -16/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 63 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 81 × 7 = 567,
   18/81 = 18 × 7/81 × 7 = 126/567
3. Likewise, for the 2nd fraction, since 63 × 9 = 567,
   30/63 = 30 × 9/63 × 9 = 270/567
4. Subtract the two like fractions:
   126/567 - 270/567 = 126 - 270/567 = -144/567
5. After reducing the fraction, the answer is -16/63

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