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A variable is a lettter, such as a or b or y, that represents one or more numbers. 


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An algebraic expression is an expression that includes one or more variables 


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Substituting is when you replace a variable in an algrbraic expression with a number. 


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To evaluate an algebraic expression, substitute a number for each variable and calculate. 


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Natural numbers are numbers used for counting: 1, 2, 3, and so on. 


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Whole numbers are the natural numbers and zero: 0, 1, 2, 3, and so on. 


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Rational numbers include fractions and improper fractions: 2/3, 6/3, 4/1. These numbers include natural and whole numbers. 


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Grouping symbols indicate that the operations within them should be done first. Parentheses and The fraction bar are grouping symbols. 

