Answers

Subtract 63/28 from 27/20

1^st number: 1 7/20, 2^nd number: 2 7/28

27/20 - 63/28 is -9/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 28 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 20 × 7 = 140,
   27/20 = 27 × 7/20 × 7 = 189/140
3. Likewise, for the 2nd fraction, since 28 × 5 = 140,
   63/28 = 63 × 5/28 × 5 = 315/140
4. Subtract the two like fractions:
   189/140 - 315/140 = 189 - 315/140 = -126/140
5. After reducing the fraction, the answer is -9/10

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