evaluate - When you _______ an expression, you replace the variable with a given value.  , expression - A(n) _______ is a mathematical phrase that can contain numbers, variables, and operation symbols. , factor - When two numbers are multiplied to get a product, each number is called a(n) _______. , order of operations - The set of rules used to determine the order in which operations are performed is called the _______. , substitute  - To evaluate a + 3 when a = 7, you can _______ 7 for a in the expression. , term - Each part of an expression that is separated by a plus or minus sign is a(n) _______.,

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