Answers

Subtract 12/84 from 90/80

1^st number: 1 10/80, 2^nd number: 12/84

90/80 - 12/84 is 55/56.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 84 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 80 × 21 = 1680,
   90/80 = 90 × 21/80 × 21 = 1890/1680
3. Likewise, for the 2nd fraction, since 84 × 20 = 1680,
   12/84 = 12 × 20/84 × 20 = 240/1680
4. Subtract the two like fractions:
   1890/1680 - 240/1680 = 1890 - 240/1680 = 1650/1680
5. After reducing the fraction, the answer is 55/56

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