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SUBJECT: Mathmatics Elmentary 4th Grade
Projecting the graph in the text book in large on the screen with the document camera, you can easily instruct the class how to draw and read the line graphs.
THIS IS HOW TO PROJECT IT !!

1. Show it in large and explain how to read number line.

2. Even quite complex cubic graphics, it can be easily explained by projecting it in large on the screen with the document camera.
POINT!!
No need to prepare an extra black board to draw the cubic graphics or number lines. You can efficiently save the time.