Much of mathematics involves memorizing rules and procedures. Often times these procedures we learn are not very hard but because we have to memorize many steps and rules it’s easy to mix things up. One of the most common places I see students mix up basic rules is working with positive and negative numbers. I can’t tell you how many mistakes I have seen students make because they simply “forget” a basic rule. Moreover if the student does not master these rules (like the positive and negative numbers) they will be on the path of having a rough time in middle and high school math. Sometime ago I made a YouTube video that goes over the rules of positive and negative numbers- have your child watch it if you think they have problems in this area. Of course don’t forget the full chapter on this on the site as well it’s in the Real Numbers section.