Answers

Subtract 20/27 from 90/28

1^st number: 3 6/28, 2^nd number: 20/27

90/28 - 20/27 is 935/378.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 27 is 756
   
   Next, find the equivalent fraction of both fractional numbers with denominator 756
2. For the 1st fraction, since 28 × 27 = 756,
   90/28 = 90 × 27/28 × 27 = 2430/756
3. Likewise, for the 2nd fraction, since 27 × 28 = 756,
   20/27 = 20 × 28/27 × 28 = 560/756
4. Subtract the two like fractions:
   2430/756 - 560/756 = 2430 - 560/756 = 1870/756
5. After reducing the fraction, the answer is 935/378
6. In mixed form: 2179/378

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