Subtraction-make it true

Walt: Balance equations.

To play this game I had to balance this equation. At first, I didn’t know how to play this game so I kept playing and playing. This is how I played the game. First I read the 7-2=5 and then I had to think of what number would make the equation right for ten. I straight away knew that it was 5 because 10-5=5 and 7-2=5. It wasn’t difficult. What I need to learn next is to subtract two digit numbers.  

This I my score.