Download (2) The measurement model – uses directed arrows on a number

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3. WHOLE NUMBERS: OPERATIONS AND PROPERTIES
(2) The measurement model – uses directed arrows on a number line.
Properties of whole number addition:
Closure property
The sum of any two whole numbers is a whole number.
Example. The even whole numbers are closed under addition.
The odd whole numbers are not closed under addition. Why?
Commutative property
Let a and b be any whole numbers. Then a + b = b + a.
Associative property
Let a, b, and c be any whole numbers. Then
(a + b) + c = a + (b + c).
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