The operation that the seven year old Zoli depends on to help him in explaining the problem is identity operation.
In the video Zoli is seen using the mathematical identity operation as he explains this problem.
In other to carry out this operation, you have to use an identity element that is a member of a set which would be used to operate on a different member x.
Read more on identity operations here:
https://brainly.com/question/13139218