The first post regarding Addition and Subtraction properties focused on Addition.
This post will show you properties, examples and definitions to: Take Away, Comparison and Missing Addend.
Subtraction of Whole Numbers: For any while numbers, r and s, with r greater than or equal to s, the difference of r minus, written r - s, is the whole number c such that r = s + c. The number c is called the MISSING ADDEND. This dorky video helps with finding the missing addend in subtraction. Here is an example of the finding the missing addend:
12 - 6. To find the missing addend you must find the number that can be added to 6 to equal 12. Clearly, the answer is 6. Another fun example would to use money. I gave my waitress $2.00 and my change is 45 cents. The waitress will count up from 45 to 200 to determine my change.
The Take-Away Concpet: Suppose that you have 15 apples and take away 5, how many apples to do you have left? 15 - 5 = 10. This will help as future teachers to teach to your students; giev them objects to "take away".
The Comparison Concept: Suppose you have 15 apples and someone else has 5 apples. How many more apples do you have than the other person? We then compare our collection to the other persons to see what the difference is! Which would then lead back to 15 - 5 = 10.
All these different concepts help us better understand subtraction and fun ways to teach our students someday! :)
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