Algebra 1 Unit 1 Section 1 2 Notes

Algebra 1 Unit 1 Section 1. 2 Notes: Order of Operations

Order of Operations: the rule that lets you know which operation to perform first. Example 2

Example 3 •

• When one or more grouping symbols are used, evaluate within the innermost grouping symbols first. • Grouping symbols such as parentheses ( ), brackets [ ], and braces { } are used to clarify or change the order of operations.

Example 4 •

To evaluate an algebraic expression, replace the variables with their values. Then find the value of the numerical expression using the order of operations.

Example 5 •

Example 6: Each side of the Great Pyramid of Giza, Egypt, is a triangle. The base of each triangle once measured 230 meters. The height of each triangle once measured 187 meters. The area of a triangle is onehalf the product of the base b and its height h. a) Write an expression that represents the area of one side of the Great Pyramid. b) Find the area of one side of the Great Pyramid.

Extra Example According to the California Department of Forestry, an average of 539. 2 fires each year are started by burning debris, while campfires are responsible for an average of 129. 1 each year. a) Write an algebraic expression that represents the number of fires, on average, in d years of debris burning and c years of campfires. b) How many fires would there be in 5 years?

Exit Slip •