1. 5 Minute Check Complete on the back of your homework. 1. 9 + 12 - 15 2. (9 + 2) · 6 - 5 3. 26 + 6² ÷ 4 4. 22 ÷ 2 · 3²

2. 5 Minute Check Complete on the back of your homework. 1. 9 + 12 - 15

3. 5 Minute Check Complete on the back of your homework. 1. 9 + 12 – 15 21 – 15 6

4. 5 Minute Check Complete on the back of your homework. 2. (9 + 2) · 6 - 5

5. 5 Minute Check Complete on the back of your homework. 2. (9 + 2) · 6 – 5 11 · 6 -5 66 -5 61

6. 5 Minute Check Complete on the back of your homework. 3. 26 + 6² ÷ 4

7. 5 Minute Check Complete on the back of your homework. 3. 26 + 6² ÷ 4 26 + 36 ÷ 4 26 + 9 35

8. 5 Minute Check Complete on the back of your homework. 4. 22 ÷ 2 · 3²

9. 5 Minute Check Complete on the back of your homework. 4. 22 ÷ 2 · 3² 22 ÷ 2 · 9 11 · 9 99

10. Flashcards

11. Wednesday, Nov 20 Lesson 6.3 Algebra: Variables and Expressions

12. Objective: To find the value of expressions using the order of operations.

13. Algebra: Variables and Expressions At the end of this lesson you should be able to answer the following question. How are numerical expressions and algebraic expressions different?

14. Algebra: Variables and Expressions Algebra is a language of symbols including variables.

15. Algebra: Variables and Expressions Algebra is a language of symbols including variables. A variable is a symbol, usually a letter, used to represent a number.

16. Algebra: Variables and Expressions Algebraic expressions contain at least one variable and at least one operation. e.g. n + 2

17. Algebra: Variables and Expressions Evaluate 16 + b, if b = 25 16 + 25 How to solve an algebraic expression. Step 1 – Rewrite the expression without the variables.

18. Algebra: Variables and Expressions Evaluate 16 + b, if b = 25 16 + 25 41 How to solve an algebraic expression. Step 2 – Use the order of operations to evaluate the expression.

19. Algebra: Variables and Expressions Evaluate x - y, if x = 64 and y = 27 Step 1 ?

20. Algebra: Variables and Expressions Evaluate x - y, if x = 64 and y = 27 64 – 27 Step 2 ?

21. Algebra: Variables and Expressions Evaluate x - y, if x = 64 and y = 27 64 – 27 37

22. Algebra: Variables and Expressions Evaluate x · y, if x = 6 and y = 7 Do this on your own.

23. Algebra: Variables and Expressions Evaluate x · y, if x = 6 and y = 7 6 · 7 Step 1 42 Step 2

24. Algebra: Variables and Expressions 1 Evaluate 6x, if x = 2 Do this on your own. Remember, if there is no operation written it is assumed to be multiplication.

25. Algebra: Variables and Expressions 1 Evaluate 6x, if x = 2 1 6 · 2 6 2 3

26. Algebra: Variables and Expressions Evaluate 6t + 4, if t = 3 Do this on your own.

27. Algebra: Variables and Expressions Evaluate 6t + 4, if t = 3 6 · 3 + 4 Step 1 18 + 4 Step 2 22 Step 2

28. Algebra: Variables and Expressions Evaluate 6c², if c = 3 Do this on your own.

29. Algebra: Variables and Expressions Evaluate 6c², if c = 3 6 · 3² 6 · 9 54

30. Algebra: Variables and Expressions 1 Evaluate 4x², if x= 8 Do this on your own.

31. Algebra: Variables and Expressions 1 Evaluate 4x², if x= 8 1 4 · ( 8 )² 4 1 1 · 64 4 64 1 16

32. Algebra: Variables and Expressions 1 Evaluate 10a + 7, if a = 5 Do this on your own.

33. Algebra: Variables and Expressions 1 Evaluate 10a + 7, if a = 5 1 10 · 5 + 7 10 5 + 7 2 + 7 9

34. Algebra: Variables and Expressions 1 Evaluate 9e², if e= 3 Do this on your own.

35. Algebra: Variables and Expressions 1 Evaluate 9e², if e= 3 1 9 · ( 3 )² 9 1 1 · 9 9 1

36. Algebra: Variables and Expressions The amount of money that remains from a 20 dollar bill after Malina buys 4 party favors for p dollars each is 20 – 4p. Find the amount remaining if each favor is $3 each. Do this on your own.

37. Algebra: Variables and Expressions The amount of money that remains from a 20 dollar bill after Malina buys 4 party favors for p dollars each is 20 – 4p. Find the amount remaining if each favor is $3 each. $20 – 4p, if p = $3 $20 – 4 · $3 $20 - $12 $8

38. Algebra: Variables and Expressions The volume of a cube can be represented by s³, where s is the length of a side. If the length of a side of a cube is ½ meter, what is the volume? Do this on your own.

39. Algebra: Variables and Expressions The volume of a cube can be represented by s³, where s is the length of a side. If the length of a side of a cube is ½ meter, what is the volume? 1 ( 2 )³ 1 1 2 2 2 = 8

40. Algebra: Variables and Expressions How are numerical expressions and algebraic expressions different?

41. Algebra: Variables and Expressions Agenda Notes Homework – Homework Practice 6-3 Due Thursday, Nov 21 Mid-Chapter 6 Quiz – Friday, Nov 22