Negative Number Rules
Negative numbers can seem peculiar on first encounter. That is true historically.
This article from Nrich gives a short summary of how negative numbers came to be: https://nrich.maths.org/5747
This second article gives credit to some of the various cultures who are part of the negative number story: https://nrich.maths.org/5961
Lastly, this third article gives some ways to intuitively understand the arithmetic operations of negative numbers. https://nrich.maths.org/9958