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==Concept #3 The Number Line :Level 1-2 ==
==Concept #3 The Number Line :Level 1-2 ==
The number line is not just a school object. It is as much a mathematical idea as functions.
The number line is a geometric “model” of all numbers -- including 0 1, 2, 25, 374 trillion, and -5, Unlike counters, which model only counters, the number line models measurement, which is why it must start with zero. (When we count, the first object we touch is called "one." When we measur using a ruler, we line one end of the object we’re measuring against the zero mark on the ruler. <br>
[[File:Number system -Resource material_html_1de463c.jpg|400px]]<br>
===Objectives===
===Objectives===
#Numbers can be represented on a continuum called a number line
#Numbers can be represented on a continuum called a number line