Upcoming SlideShare
×

# Order Of Operations

2,770
-1

Published on

Order Of Operations

Published in: Technology, Education
3 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

Views
Total Views
2,770
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
47
0
Likes
3
Embeds 0
No embeds

No notes for slide
• Supplies: copies of worksheet
• ### Order Of Operations

1. 1. AIM: How do we properly evaluate expressions using the order of operations ? OBJECTIVE: S.W.B.A.T. use the order of operations to properly evaluate expressions Homework: Basics of Algebra – Day 1: 1 - 18 Also extra credit worksheet available at http://www.schoolrack.com/Ikhaanahoyo September 11, 2007 DO NOW Evaluate 70 - 2(5+3). Evaluate means simplify or “find the answer”
2. 2. Debrief of “Do Now” 70 - 2(5+3) 70 - 2(8) 68(8) 70 - 2(5+3) 70 - 2( 8) 70 – 16 544 incorrect  54 correct Subtraction was done before  multiplication Multiplication was done before subtraction The parenthesis here means multiplication !
3. 3. The Order of Operations In math an answer is always right or wrong so we have to have a way of letting people know which operation to do in which order so that everyone gets the same answer. This order is called the Order of Operations G raciously E xcuse M y D ear A unt S ally
4. 4. The Order of Operations Grouping Symbols , Exponents , ( Multiplication/Division ), then ( Add/Subtract ) Grouping Symbols 3 2 Exponents 9 ∙4÷2 = 18 Multiplication/Division from left to right 7 – 4 + 2 = 5 Add/Subtract from left to right [],{}, fraction bar , (),
5. 5. The Order of Operations – Example 1 Evaluate 15 ÷ 5 – 3 ∙ 2 A method that has been very successful for working with order of operations is the GEMDAS table. 3 – 3 ∙ 2 3 – 6 -3
6. 6. 10 ÷ (2 2 + 1) The Order of Operations – Example 2 10 ÷ (4 + 1) When you enter grouping symbols GEMDAS starts all over again so the exponents go first! 10 ÷ 5 2
7. 7. Warning!!! No calculators on next quiz !
8. 8. The Order of Operations – Example 3 Evaluate the expression 5 – 3 + 7 ∙ 2 5 – 3 + 14 2 + 14 Why does subtraction come before addition ? 16
9. 9. The Order of Operations – Groupwork 1, 4, 15
1. #### A particular slide catching your eye?

Clipping is a handy way to collect important slides you want to go back to later.