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Commutative property of addition
For any numbers a and b, a + b = b + a
Putting together model for addition
Suppose a count X is put together with a count y with the same units. If there is no overlap, then the result has count X plus Y.
Absolute Value
Represents the distance a number is from the value zero on a number line
Associative property of addition
For any numbers a, b, c, (a+b) + c = a + (b+c)
Slide model for subtraction
If a quantity X is decreased by an amount, Y with the resulting quantity is X - Y
Comparison model for subtraction
X-y is how much more X than y