Answers

Add 75/21 and 90/80

1^st number: 3 12/21, 2^nd number: 1 10/80

75/21 + 90/80 is 263/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   75/21 = 75 × 80/21 × 80 = 6000/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   90/80 = 90 × 21/80 × 21 = 1890/1680
4. Add the two like fractions:
   6000/1680 + 1890/1680 = 6000 + 1890/1680 = 7890/1680
5. 7890/1680 simplified gives 263/56
6. So, 75/21 + 90/80 = 263/56
   In mixed form: 439/56

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