Answers

Subtract 63/80 from 28/84

28/84 - 63/80 is -109/240.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   28/84 = 28 × 20/84 × 20 = 560/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   63/80 = 63 × 21/80 × 21 = 1323/1680
4. Subtract the two like fractions:
   560/1680 - 1323/1680 = 560 - 1323/1680 = -763/1680
5. After reducing the fraction, the answer is -109/240

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