How Subtraction Works
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This is the very beginning of understanding how subtraction works.

Let's look at this set:

5 triangles

Count how many triangles
are in this set...  There are 5!

Now, take two triangles away...

5 triangles with 2 being taken out

3 triangles left the 2 triangles that were taken out


Count how many triangles are left
in the set... 
There are 3 left!

So, 5-2=3