Chapter Four - Chapter Four: Pre-algebra: Simply arithmetic...

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Chapter Four: Pre-algebra: Simply arithmetic with one new feature: we use letters to represent numbers 4.1- It is often useful to represent numbers. This is the case when: -The number is unknown -We want to state relationships which hold for all numbers -We want to work through a calculation procedure without specifying the numbers, or - We want to show a relationship between quantities. Teacher Solution Using Algebra: pg.88-89 A numerical expression - is a combination of numbers, parentheses, and operation signs which represents a single number; Examples include: 3(4+17)-12, (8/5) x 9 An algebraic expression- a combination of numbers, parentheses, operation signs and letters which represents a number for some choice of numerical values for the letters. Example include; x+8, 3(2k+5) Statements that contain equal signs are not expressions!!! Evaluating expressions- an expression can be evaluated by assigning specific values to the letters appearing in it. Building expressions- (pg. 90) Students build expressions and then solve them.
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Chapter Four - Chapter Four: Pre-algebra: Simply arithmetic...

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