CubicPower Channel Q: Robot Math-1 plus 1 equals 2

To get the concept of number,we can map the 1 to one block. And then map the 2 to two blocks.
Therefore  "1 plus 1 equals 2" means that adding one block to another block will get two blocks.

Another way is to count fingers. One finger plus one finger equals to two fingers.

CubicPower Channel Q-Addition(Chao-Yih Hsia Animation)