This is the very beginning of understanding how subtraction works.
Let's look at this set:
![5 triangles](/sites/default/files/subtraction01-01.gif)
Count how many triangles
are in this set... There are 5!
Now, take two triangles away...
![5 triangles with 2 being taken out](/sites/default/files/subtraction01-02.gif)
![3 triangles left](/sites/default/files/subtraction01-03.gif) |
![the 2 triangles that were taken out](/sites/default/files/subtraction01-04.gif)
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Count how many triangles are left
in the set... There are 3 left! |
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![So, 5-2=3](/sites/default/files/subtraction01-05.gif)
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