1. Expressions and Equations 5.ATO.1 Evaluate numerical expressions involving grouping symbols (i.e., parentheses, brackets, braces). 5.ATO.2 Translate verbal phrases into numerical expressions and interpret numerical expressions as verbal phrases.

2. What do I have to do? By the end of this unit you will be able to: – Create an expression or equation from a word problem – Use variables to represent what you don’t know – Explain why a specific expression or equation does or does not represent a word problem – Create a word problem for a specific equation

3. #8-1 – Using Variables Take out your math textbook and math journal In your journal, copy these notes: – A variable is a part of the math problem that you have to figure out the value of A variable is represented by a letter A variable can CHANGE values – An algebraic expression is the first part of an equation and does not have an equal sign An algebraic expression must have a variable and an operation (+, -, x, ÷)

4. Using Variables to Write Expressions Put your math journal under your textbook Turn to page 194 in your textbook, follow along as we take turns reading from the section “Other Examples” Now I will model problems 1-4 on page 194, wait for me to ask for your help

5. WE DO – Try this! Let’s work on problems 5-7, you’re going to help! Raise your hand, read the problem, give your answer

6. WE DO – Try this! ANSWERS #5) n = number of CDs #6) the variable is “y” the operation is multiplication #7) (8 x 3) + n

7. YOU DO – Practice on your own Write your name and date on a blank sheet of lined paper Complete problems #8 – 19 on page 195 Turn in by 9:20am If you finish early, complete the RETEACHING SIDE of 8-1 in your workbook, do not turn in

8. Review and Reflect In your journal, try to write a word problem that might require a variable.

9. 8-2 – Order of Operations Take out your math textbook and math journal In your journal, copy these notes: – Order of Operations If you are given the value of the variable, plug it in Do the expression(s) inside (parenthesis) first Then multiply and/or divide from left to right Finally, add and/or subtract from left to right

10. Order of Operations Put your math journal under your textbook Turn to page 196 in your textbook, follow along as we take turns reading from the top of the page and the section “Another Example” Now I will model problems 1-4 on page 196, wait for me to ask for your help

11. WE DO – Try this! Let’s work on problems 5-6, you’re going to help! Raise your hand, read the problem, give your answer

12. WE DO – Try this! ANSWERS #5) Juan added and divided first instead of dividing then multiplying #6) (3+5) x 2 – 10 = 6

13. YOU DO – Practice on your own Write your name and date on a blank sheet of lined paper Complete problems #13-28 (all) on page 197 Turn in by 9:20am If you finish early, complete the RETEACHING SIDE of 8-2 in your workbook, do not turn in

14. Review and Reflect In your journal, write three expressions that have three or more operations and a set of parenthesis. Was that hard to do?