Answers

Subtract 70/63 from 20/80

1^st number: 20/80, 2^nd number: 1 7/63

20/80 - 70/63 is -31/36.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 63 is 5040
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5040
2. For the 1st fraction, since 80 × 63 = 5040,
   20/80 = 20 × 63/80 × 63 = 1260/5040
3. Likewise, for the 2nd fraction, since 63 × 80 = 5040,
   70/63 = 70 × 80/63 × 80 = 5600/5040
4. Subtract the two like fractions:
   1260/5040 - 5600/5040 = 1260 - 5600/5040 = -4340/5040
5. After reducing the fraction, the answer is -31/36

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