I need someone to build a maxtrix of numbers thats adds and subtracts

Hello! I'm looking for an experienced freelancer to help me build a matrix of numbers. The desired size of the matrix is 8 x 8 and I do not want it to include negative numbers. The purpose of creating this matrix is for my personal interest. I need someone who can create a matrix that adds and subtracts. Please let me know if you are up to this challenge!