PRACTICE AND CLASS WORK GRADE

6.8

Order of Operations Computer Tutorial

INTRODUCTION

If you are asked to simplify the expression

"4 + 2×3", the question that naturally arises is "Which way do I do this? Because there are two options!":

Choice 1: Just do it straight across…WRONG!!!

Choice 2:  Follow Order of operations YES!!!!

IT MEANS THE ORDER IN WHICH YOU DO EACH OPERATION (+, -, ÷, • ) IN AN

EXPRESSION.

THE ORDER IS REMEMBERED BY PLEASE EXCUSE MY DEAR AUNT SALLY

Um…What’s that?

Please

Excuse

My Dear

Aunt Sally

Parenthesis

Exponents

Multiplication Division (first come first serve)

Addition Subtraction (first come first serve)

Let’s Evaluate the Expression Parenthesis? ……………………………………………………………………………………………………

Exponents? …………………………………………………………………………………………………….. Multiplication /Division? Yes! Okay, solve those from left to right (first come first serve)……………………..................

Addition /Subtraction? Yes! Okay, solve those from left to right (first come first erve)…………………………………...

Now, if you did it straight across like it is written it would be 4 + 2 = 6 x 3= 18……But the Answer is NOT 18!!!!

The answer is 10!Order Matters!!!!

4 + 2 x 3

4 + 6

nono

10

Parenthesis? YES!……………………………………………………………………………………………

Exponents? YES!…………………………………………………………………………………………….. Multiplication /Division? Yes! Okay, solve those from left to right (first come first serve)……………………..................

Addition / Subtraction? Yes! Okay, solve those from left to right (first come first serve)…………………………………...

Let’s Evaluate the Expression 2 25 – (27-11) + 18 ÷ 2

2 25 – 16 + 18 ÷ 2

2 32 – 16 + 18 ÷ 2

64 – 16 + 18 ÷ 264 – 16 + 9

48 + 9

57

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MD

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When you evaluate

expressions, it is very important to set your paper up for the order of

operations. Sometimes

nothing is written in a space,

sometimes many things are written

in a space.

Set up your paper like this with the Green PEMDAS. Then write the

example on your paper as you click through each step to practice how it works. Each click does a new step.

3 + (8 x 4) + 30 ÷ 5 x 7 - 9 3 + 32 + 30 ÷ 5 x 7 - 9

3 + 32 + 6 x 7 - 9 3 + 32 + 42 - 9

77 - 9

68

35 + 42 - 9

Let’s visit some websites to see more!

http://www.mrnussbaum.com/orderops.htm

There is an error on the game problem- should be a negative number

http://www.math-play.com/Order-of-Operations-Millionaire/order-of-operations-millionaire.html

EXIT TICKET -Show all steps (graded) Name

Date

Evaluate the expression – remember to rewrite the expression after each step

5 2 3 – (27-21) + 10 P

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