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(x squared + 3) and x=4

5(16 + 3) = 5*19 = 95

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

Miss Vilardo's Favorites

100

Favorite color??

BLUE

200

FAVORITE CANDY

TWIX

300

FAVORITE FOOD 

FRENCH FRIES

400

FAVORITE NUMBER

17

500

FAVORITE TYPE OF DOG

GOLDEN RETRIEVER

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

9

300

t/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