Evaluating Variable Expressions

Order of operations

100

What does "PEMDAS" stand for?

P = parentheses E = exponents M = multiplication D = division A = addition S = subtraction

200

What does 8 to the power of 2 mean?

8*8, or 64.

300

In the expression 6(7 + 9), which step should we start with according to PEMDAS?

7+ 9 = 16

400

Solve: 5(x² + 3) and x=2

5((2²) + 3) = 5(4 + 3) = 5(7) = 35

500

Solve: 3(x + 9) - 3 ; use x = 4

3(4 + 9) - 3 = 3(13) - 3 = 39 - 3 = 36

Two-variable expressions

100

3(y + x) ; use x = 4, y = 0

3(4) = 12

200

4 + xy ; use x = 7 and y = 3

4 + 21 = 25

300

8(5 - x) - y ; use x = 3 and y = 12

8(5 - 3) - 12 = 8(2) - 12 = 16 - 12 = 4

400

(c + d) + 4(c) ; use c = 8, d = 9

(8 + 9) - 4(8) = 17 + 32 = 49

500

5(f - h) - 2h ; use h = 3, f = 5

4

Random!

100

Name one of Ms. Nakamine's pets. 

(Double points if you can name 2)

(Triple points if you can name all 3)

Marquette

Phoenix

Beans

200

Which game site that we use for class is the best?

(Gimkit, Blooket, Jeopardy, Kahoot, etc.)

Any answer gets points

300

In the order of operations, what step do you do AFTER subtracting?

Trick question: there is no step after subtracting!

400

4+8+15+16+23+42=

108.

500

Make up a new way to remember the Order of Operations instead of, for example, "Please Excuse My Dear Aunt Sally". 

P

E

M

D

A

S

Exponents

100

What is 2 cubed?

8

200

What is 3 TO THE FOURTH POWER?

81

300

WHAT IS 1 TO THE 100TH POWER?

1

400

x(Y squared) ; use x = 3, y = 5

75

500

y(y to the third power) + x ; use x = 3, y = 2

16 + 3 = 19

One-variable expressions

100

4(x) ; x = 12

48

200

12y ; use y = 3

36

300

t x 18 ; use t = 0

0

400

(5y - y)/2 ; use y = 6

(30 - 6)/2 = 24/2 = 12

500

(50 + g)/g +35 ; use g = 10

41