Answers

Subtract 90/70 from 30/36

1^st number: 30/36, 2^nd number: 1 20/70

30/36 - 90/70 is -19/42.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 70 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 36 × 35 = 1260,
   30/36 = 30 × 35/36 × 35 = 1050/1260
3. Likewise, for the 2nd fraction, since 70 × 18 = 1260,
   90/70 = 90 × 18/70 × 18 = 1620/1260
4. Subtract the two like fractions:
   1050/1260 - 1620/1260 = 1050 - 1620/1260 = -570/1260
5. After reducing the fraction, the answer is -19/42

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