division , addition

Question

45/67 + 77/89 =? dear pls help me out in solving this kind of problems..

Answer 1

We can add or subtract fractions only with the same denominators.
If denominators are different, first, we have to find the least common denominator (LCD).
In our case 67 and 89 are prime numbers, therefor
LCD(67, 89) = 67 × 89 = 5963
If we multiply denominator by some number, we must multiply numerator by the same number.
  45 * 89        77 * 67    
————— + ————— =
    5963            5963  
          
    4005           5159     
  ————  +  ————  = 
    5963           5963      

  4005 + 5159 
 ———————  = 
       5963 

 9164            3201
———  =  1  ———  
 5963            5963  

Answer 2

Just divide each fraction to get two decimal numbers, then add them:

45/67 = 0.6716

77/89 = 0.8652

0.6716 + 0.8652 = 1.5368

Answer 3

1. Multiply the denominators

2. Multiply first numerator by second denominator.

3. Multiply second numerator by first denominator.

4. Add the products of Steps 2 and 3 in the numerator

45/67 + 77/89 = (45*89 + 67*77)/(67*89)