Answers

Subtract 63/84 from 9/80

9/80 - 63/84 is -51/80.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 84 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 80 × 21 = 1680,
   9/80 = 9 × 21/80 × 21 = 189/1680
3. Likewise, for the 2nd fraction, since 84 × 20 = 1680,
   63/84 = 63 × 20/84 × 20 = 1260/1680
4. Subtract the two like fractions:
   189/1680 - 1260/1680 = 189 - 1260/1680 = -1071/1680
5. After reducing the fraction, the answer is -51/80

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