Mr. Rizzo Grade 9 Mathematics Click here to go to the Menu.

Mr. Rizzo

Grade 9 Mathematics

Order of Operations

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This mean you have to follow this stops to do these type of problems

1) Do what's is the Parentheses2)Next do the Exponents3) Then Do the Multiplication and Division do

in the order the come in the problem4) Finally you do the Addition and Subtraction

you do these in the order the way they come

Order Of Operations (PEMDAS)

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Doing what is in the parentheses is the first thing you need to do.

So for this problem: (8+6-4) x 2So you do the 8+6-4 first Winch is 10 Next you times 10 by 2 to get the answer of 20

Parentheses

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Second step you need to do is to calculate the exponents in the problem

So in this problem (8+6-4)^2So you have to do the parentheses which comes out to 10Now you take 10^2 And the answer is 100

Exponents

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The third step is to do the multiplication and division in the problem what ever comes first in the problem then that’s the way you do it

Try this problem 12x3/4So you take 12x3Which is 36Then divide it by 4And the answer is 9

Multiplication and Division

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The last step to do is to the addition and subtraction in the problem. You do whichever comes first in the problem .

Try this one 8+4-5+6-2-2So you do it one by one and you get an answer of 9

Addition and Subtraction

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Find the Answer using order of operations (15 +50 - 5 ) ÷20 – 3

A) 8

B) 5

C) 3

D) 0

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Nice try but I am sorry that 8 is not the correct answer. Please click on the button and the bottom of the screen and try again.

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Nice try but I am sorry that 3 is not the correct answer. Please click on the button and the bottom of the screen and try again.

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Good Job 0 is the correct answer please click on the button on the bottom of the screen to do another question.

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Solve this (9 - 3 )^ 2 + ( 5 - 12 ÷ 2 )

A) 40

B) 42

C) 35

D) 36

Question 2

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Nice try but I am sorry that 42 is not the correct answer. Please click on the button and the bottom of the screen and try again.

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Nice try but I am sorry that 36 is not the correct answer. Please click on the button and the bottom of the screen and try again.

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35 is the correct answer. You have completed this lesson please click on the button at the bottom of the slide for the next student. Thank you and Good Job!!

Great Job!!!

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