Manipulatives

It is easy for a student too add or break down manipulatives. It can simply be by tearing two blocks apart. It is a very hand on method.

https://www.teachingchannel.org/videos/teach-fractions-with-manipulatives

You get to actively see what it is being added or taken away in the case of addition

In the case of multiplication you can see the "groups of" when multiplying numbers together.