Danny has 8 bottle caps in his collection. He found some more bottle caps at the park. If he has 12 bottle caps now How many bottle caps did he find at the park?
Danny has 8 bottle caps in his collection. 
He found some more bottle caps at the park. 

We want to know how many bottle caps he found at the park. 

We can set up an equation to solve this problem: 

8 + x = 12 

We want to solve for x, which is how many bottle caps he found at the park. 

We can solve this equation by using inverse operations. We want to move everything except for x to one side. 

To do this, we can add -8 to each side. 

8 + x = 12 
8 + x - 8 = 12 - 8 

Now we have: 

x = 4 

Danny found 4 bottle caps at the park.