Addition and Substraction

This morning, I was be a volunteer in two classes.
In the first class (Year 1), I helped students using computers with a kid pix program. They were using this program to write their name.
In the second class (Year 2), I helped a group of students to learn about numbers using online resources, namely:
1. base blocks
2. number puzzle
3. addition 2 digits
I have learnt much from the students and teachers by being volunteer in their classrooms.
This experiences