Expressions

Order of operations

100

What does "PEMDAS" stand for?

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

200

How do we decide whether to add or subtract first?

Left to right, whichever comes first

300

In the expression 9 x 3 - (7 + 9), which step should we start with according to PEMDAS?

7+ 9 in Parentheses

400

Which step should we do first 3 + 4² - 6

Exponent 4²

500

(5-3)³ - 7

1

Evaluate algebraic expressions

100

3(y + x) ; use x = 4, y = -1

9

200

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

 25

300

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

4

400

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

49

500

5(f - h) + 2h ; use h = –1, f = 2

13

Combine Like Terms

100

4x + 2x + 7x

13x

200

5y + 7x + 3 + 4x + 2

5y + 11x + 5

300

10x + 4y + 3 + 2x – 2y 

12x + 2y + 3

400

5x + 3y - 4x + 4y + 3

x + 7y + 3

500

3a + 2 + 9a - 4a + 5a - 16

9a - 14

Exponents

100

What is 2²?

4

200

What is 3³?

27

300

x⁴ ; use x = 3

81

400

x(y²) ; use x = 3, y = 5

75

500

y(y ³) + x ; use x = 3, y = 2

19

Vocabulary

100

What do we call a number by itself (with no variable)?

A constant

200

A letter of the alphabet that represents an unknown number is called what?

variable 

300

How many terms are in this expression?

2x + 5 + 8y

3

400

What is it called when we add terms that are alike?

Combining Like terms

500

a number in front of a variable is called what?

coefficient