Answers

Subtract 63/28 from 81/20

1^st number: 4 1/20, 2^nd number: 2 7/28

81/20 - 63/28 is 9/5.

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,
   81/20 = 81 × 7/20 × 7 = 567/140
3. Likewise, for the 2nd fraction, since 28 × 5 = 140,
   63/28 = 63 × 5/28 × 5 = 315/140
4. Subtract the two like fractions:
   567/140 - 315/140 = 567 - 315/140 = 252/140
5. After reducing the fraction, the answer is 9/5
6. In mixed form: 14/5

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