If i have - 52 balls and my mom had to give me 200 balls how much do i have?

Since you have - 52 and your mom gives you more, you would add 200 to - 52. Or you could subtract 52 from 200. Either way, you will still get the result 148 balls. And so you will have 148 balls total.

You would have 142 balls because a negative plus a positive is postive