Answers

Subtract 20/12 from 30/28

1^st number: 1 2/28, 2^nd number: 1 8/12

30/28 - 20/12 is -25/42.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 12 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 28 × 3 = 84,
   30/28 = 30 × 3/28 × 3 = 90/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   20/12 = 20 × 7/12 × 7 = 140/84
4. Subtract the two like fractions:
   90/84 - 140/84 = 90 - 140/84 = -50/84
5. After reducing the fraction, the answer is -25/42

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