Answers

Add 90/80 and 50/42

1^st number: 1 10/80, 2^nd number: 1 8/42

90/80 + 50/42 is 389/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 42 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 42 × 40 = 1680,
   50/42 = 50 × 40/42 × 40 = 2000/1680
4. Add the two like fractions:
   1890/1680 + 2000/1680 = 1890 + 2000/1680 = 3890/1680
5. 3890/1680 simplified gives 389/168
6. So, 90/80 + 50/42 = 389/168
   In mixed form: 253/168

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