Answers

Subtract 63/70 from 54/80

54/80 - 63/70 is -9/40.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 70 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 80 × 7 = 560,
   54/80 = 54 × 7/80 × 7 = 378/560
3. Likewise, for the 2nd fraction, since 70 × 8 = 560,
   63/70 = 63 × 8/70 × 8 = 504/560
4. Subtract the two like fractions:
   378/560 - 504/560 = 378 - 504/560 = -126/560
5. After reducing the fraction, the answer is -9/40

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