What are simple math equations?

Adding, subtracting, and multiplying fractions are pretty easy depending on the level of knowledge. Other easy equations could be inverse operations.

The ones you could search on google or ask your parents about or an equation you could do in your head like 2 + 2 ... you already knew it was 4 because your brain can instantly solve the equation because it's simple equations like these that require little to no effort. In short, the simple equations are ones you DONT have to do