How are cancellation and subtraction different? (Examples of subtraction problems with chips)

L1 Zeroation/Cancel-Best Definition 
-When a +/- are put into a collection and it's net value doesn't change. The problem's net value doesn't change.


How is this helpful to us? 
-Clear zeros to simplify problem 



When you have zeroation, what does it do to the netvalue?

-It doesn't do anything. It does nothing to the value, it is just zero.


2-7=

Way 1

 

          Step 1                                      Step 2                                     Step 3

Way 2

            Step 1                                                                              Step 2



147-132=

How would I figure out how many zeros I need to add to the pot?

367-147=220
I need 220 zeros