Order of Operations & Variable Expression

Word Stuff

100

Give the correct order of operations.

Grouping Symbols Exponents Multiplication OR Division Addition OR Subtraction

200

Why is it important to know PEMDAS as a mathematician?

So everyone can solve every problem the same (correct) way.

300

What is the saying we use to remember the correct Order of Operations?

Please Excuse My Dear Aunt Sally.

400

What is the difference between an expression and an equation?

An expression is does not have an equal sign, but an equation does.

500

The problem was 20 - 5 x 2 + 3. My answer was 33. What did I do wrong?

I went from left to right without using the correct order of operations.

Fix my Mistake

100

9 - 3 x 2=12

Correct answer is 3. Do x then -, not - then x.

200

5 x 5 + 1=30

Multiply before adding. The correct answer is 26.

300

(3+30/3)+2 = 13

You're supposed to divide before adding. The correct answer is 16.

400

4 + 5 + 7 - 3 x 2 = 26

You need to follow PEMDAS and do x first. Correct answer is 10.

500

29 - (15 + 5) + 4 = 23

You are supposed to do parenthesis first. The correct answer is 13.

Solve

100

3 + 4 x 5

23

200

7 + (2 x 4) - 1

14

300

56 ÷ (4+4)

7

400

20 – (5+3) x 2 + 4

8

500

(5 x 4) – 6 ÷ 2 + 9

26

Solve

100

14 - 2 x 7

0

200

49 ÷ (3+4)

7

300

5 + 14 ÷ 2 × 5

40

400

(4-1) + (5+ 1)

9

500

(3 x 3 - 3 x 1) + 4 

10

Variable Expressions

100

What is a variable?

A letter or symbol that replaces an unknown number

200

Write the variable expression for: 6 less than y

y - 6

300

Write the variable expression for: the product of a number and 6

6y

400

Write a variable expression for: the difference of 12 and t

12 - t

500

Write a variable expression for: the difference of a number times 6 and 2

6n - 2