For a copy of the notes, vocabulary, and interactive activities, visit me at [ Ссылка ].
This lesson explains how to add integers using yellow/red counter chips AND number lines. Four different types of problems are given: positive/positive, negative/positive, positive/negative, and negative/negative.
![](https://s2.save4k.ru/pic/R1m-3lANNlA/mqdefault.jpg)