Order of Operations

Fix the Mistake

100

What did they do wrong?

9 - 3 x 2 = 12

9 - 3 x 2 = 3

They subtracted before multiplying.

200

What did they do wrong?

10 ÷ 5 x 2 = 1

They multiplied before dividing. Need to work left to right.

10÷5 x 2 = 4 

300

What did they do wrong?

5 x 5 +1 = 30

They added before multiplying.

5 x 5 + 1= 26

400

What did they do wrong?

3 + 2 x 2 - 2 = 3

They subtracted first before multiplying.

3 + 2 x 2 - 2

3 + 4 - 2

7 - 2 = 5

500

What did they do wrong?

(1 + 2) - 1 x 4  = 8

They subtracted before multiplying

(1+2) - 1 x 4 

3 - 1 x 4 

3 - 4 = -1

PEMDAS

100

Give the correct order of operations.

Parenthesis, Exponents (still correct if step not included), Multiplication/Division, Addition/Subtraction

200

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

Please Excuse My Dear Aunt Sally

or

Pass My Dad A Sandwich

300

When an expression has parentheses within parentheses, which set should you calculate first? 

Innermost Parentheses or Outermost Parentheses?

Innermost Parentheses

400

If I have addition and subtraction in my expression, I should move from ______ ___ _______.

left to right

500

Why is it important to know PEMDAS as a mathematician?

So that everyone is solving the problem in the same way

Solve 1

100

3 + 6 x 4

27

200

7 + 3 x (8 ÷ 4)

13

300

12 - 8 ÷ 2 + 3

11

400

20 ÷ (8 - 3) + 16 

20

500

((2 + 3 x 4) + 2 − 7) ÷ (4 − 1)

3

Solve 2

100

(14 + 6) x (12 - 4) - 9

151

200

(15 - 5) x 10  + 3

103

300

6 x 8 + ( 7 - 6 )

49

400

( 10 + 19 - 5 ) x 2

48

500

((1 + 2) x 3 x 2 - 30 x 2) + 2³

14

Random

100

Which artist painted the Mona Lisa?  

Leonardo da Vinci

200

Which tree produces acorns? 

Oak Tree

300

What is the longest river in the world?

Nile River

400

Which country invented soccer (futbol)?

England

500

Which TV series is set in the fictional town of Hawkins, Indiana?  

Stranger Things