Answers

Subtract 90/70 from 30/28

1^st number: 1 2/28, 2^nd number: 1 20/70

30/28 - 90/70 is -3/14.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 70 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 28 × 5 = 140,
   30/28 = 30 × 5/28 × 5 = 150/140
3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
   90/70 = 90 × 2/70 × 2 = 180/140
4. Subtract the two like fractions:
   150/140 - 180/140 = 150 - 180/140 = -30/140
5. After reducing the fraction, the answer is -3/14

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