math inverse operation of 500-143 or help with understand inverse

Question

try to help 3rd grade grandson with inverse operation i do not understand

Answer 1

i think you use the operation such as, + to - or * to /

Answer 2

i dont know what my answer is. I NEED HELP

Answer 3

I THINK the inverse of 500 - 143 = 357 would the opposite operation, and the problem in the reverse order: 357 + 143 = 500