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Order of operations
Parentheses, Exponents, Multiply/Divide, Add/Subtract (Please Excuse My Dear Aunt Sally)
If parentheses can be moved to group different numbers in an arithmetic problem without changing the result, then the operation is associative. Addition and multiplication are associative.
2 + (3 + 4) = (2 + 3) + 4
2 (ab) = (2a) b
The value that, when added to a number, does not change the number. For all integers, the additive identity is 0.
5 + 0 = 5
The value that, when multiplied by a number, does not change the number. For all integers, the multiplicative identity is 1.
5 x 1 = 5
The number that, when multiplied by the number, gives you the multiplicative identity (1).
1/5 is the multiplicative identity of 5
The number that, when added to the number, give you the additive identity (0).
The additive inverse of 3 is -3
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