Answers

Subtract 40/28 from 20/27

1^st number: 20/27, 2^nd number: 1 12/28

20/27 - 40/28 is -130/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 27 and 28 is 756
   
   Next, find the equivalent fraction of both fractional numbers with denominator 756
2. For the 1st fraction, since 27 × 28 = 756,
   20/27 = 20 × 28/27 × 28 = 560/756
3. Likewise, for the 2nd fraction, since 28 × 27 = 756,
   40/28 = 40 × 27/28 × 27 = 1080/756
4. Subtract the two like fractions:
   560/756 - 1080/756 = 560 - 1080/756 = -520/756
5. After reducing the fraction, the answer is -130/189

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