Answers

Subtract 70/12 from 90/28

1^st number: 3 6/28, 2^nd number: 5 10/12

90/28 - 70/12 is -55/21.

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,
   90/28 = 90 × 3/28 × 3 = 270/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   70/12 = 70 × 7/12 × 7 = 490/84
4. Subtract the two like fractions:
   270/84 - 490/84 = 270 - 490/84 = -220/84
5. After reducing the fraction, the answer is -55/21

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