Question

How do I do this ?
How do I know which numbers to add???

Answer 1

It is pretty easy (5)

Explanation:

It is just the half of that number :)

Answer 2

Well I'm pretty sure the answer is 6 and if u look at the far left there is 4 and at the right there is 10 which you r trying to equal so u subtract those to and I get 6. Hope this helped not good at explaining things so sorry.