Answers

Add 90/84 and 45/80

1^st number: 1 6/84, 2^nd number: 45/80

90/84 + 45/80 is 183/112.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   90/84 = 90 × 20/84 × 20 = 1800/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   45/80 = 45 × 21/80 × 21 = 945/1680
4. Add the two like fractions:
   1800/1680 + 945/1680 = 1800 + 945/1680 = 2745/1680
5. 2745/1680 simplified gives 183/112
6. So, 90/84 + 45/80 = 183/112
   In mixed form: 171/112

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