Download presentation

Presentation is loading. Please wait.

Published byCameron Paul Modified over 2 years ago

1
Sign Operations 07/27/12lntaylor ©

2
Table of Contents Learning Objectives Signs and symbols mean different things Memorizing Opposite symbols Practice 07/27/12lntaylor ©

3
LO1: LO2: Define and differentiate signs and symbols Eliminate 80% of your mistakes by focusing on signs and symbols 07/27/12lntaylor © TOC Learning Objectives

4
Def1: Def2: Sign – there are only two signs + and - Symbols in math tell you what to do (operations) 07/27/12lntaylor © TOC Definitions

5
PK1:Knowledge of mathematical symbols 07/27/12lntaylor © TOC Previous Knowledge

6
07/27/12lntaylor © TOC SignsMeaning +Positive number to the right of 0 -Negative number to the left of 0 Note1: Note 2: There are only 2 signs They are seldom used properly It is true!!

7
07/27/12lntaylor © TOC SymbolsOperations Meaning +Do not change the following sign(s) Also means go right -Change the following sign(s) Also means go left x,*,( )Multiply numbers next to symbol /, − Divide numbers next to symbol Root of the number under the symbol =Left side is exactly the same as the right side

8
Signs and Symbols 07/27/12lntaylor © TOC

9
Step1: Step2: Sign – there are only two signs + and - There are no signs in this problem There are only symbols telling you what to do 07/27/12lntaylor © TOC 3 + 1 = 4 These are symbols Step3:Where are the signs? Let me show you The signs are in red and the symbols in gold + 3 + + 1 = + 4 Step4:The first + is a symbol telling you not to change the second + Let me show you Do not change the positive number! Note:The + means start at 3 and go to the right 1 Hard to believe? Let me show you more. 3 + 1 = 4

10
Step1: Step2: Sign – there are only two signs + and - There are no signs in this problem There are only symbols telling you what to do 07/27/12lntaylor © TOC 3 - 1 = 2 These are symbols Step3:Where are the signs? Let me show you The signs are in red and the symbols in gold + 3 - + 1 = + 2 Step4:The first - is a symbol telling you to change the second + Let me show you Change the positive number! Note: 3 - 1 = 2 The - means start at 3 and go to the left 1 Hard to believe? Let me show you more.

11
Step1: Step2: Sign – there are only two signs + and - There is an extra sign in this problem And a symbol telling you what to do 07/27/12lntaylor © TOC 3 - - 1 = 4 This is a symbol Step3:Where are the signs? Let me show you The signs are in red and the symbols in gold + 3 - - 1 = + 4 Step4:The - is a symbol telling you to change the - Let me show you Change the negative number! Note:See/ there are no positive and negative signs…only symbolic operations 3 + 1 = 4 This is a sign

12
Step1: Step2: Sign – there are only two signs + and - There are no signs in this problem There are only symbols telling you what to do 07/27/12lntaylor © TOC -3(4) + 2 = -10 These are symbols Step3:The first – says start at 0, go left 3 times (4 units each time or 12 units) The next symbol + says go to the right 2 from where you were The last symbol says you will end up 10 left of 0 - 12 + 2 = - 10 Note:Do you see that symbols tell you what to do and signs tell you where you are? -12 -10 0

13
Step1: Step2: Sign – there are only two signs + and - There are no signs in this problem There are only symbols telling you what to do 07/27/12lntaylor © TOC -3(4x + 5) + 2 = -12x - 13 Step3:The first symbol – says start at 0, go left 3 times (4x + 5 each time) This is why - ( )means change the signs in the ( ) after you multiply The next symbol + says do not change the sign - 3( + 4x + 5) + 2 = - 12x - 13 Note:Do you see that symbols tell you what to do and signs tell you where you are? – 12x – 15 + 2 = – 12x – 13

14
07/27/12lntaylor © TOC Note1: Note2: Now you know the difference between signs and symbols What you thought was a sign is really a symbol telling you go left or right -12 - 4 0 6 10 12 -12 + 18 – 10 + 14= 10 Start at 0 Go left 12 Go right 18 Go left 10 Go right 14 You will end up at 10 to the right of 0

15
07/27/12lntaylor © TOC Memorizing opposite symbols

16
07/27/12lntaylor © TOC SymbolWhat is its opposite? + - * / xexe > - > > > > > + / * xexe clear answers

17
07/27/12lntaylor © TOC Practice

18
07/27/12lntaylor © TOC Sign ProblemAnswer 3(4x – 5) = ? 9 - -12 = ? -4(-5 + 3x) = ? -3(3x – 3) – 2(3x + 6) = ? -4(-5 -6x) = ? -4(4x 2 + 5) = ? > 12x - 15 > > > > > 21 20 – 12x - 15x - 3 20 + 24x - 16x 2 - 20 clear answers

Similar presentations

OK

Integers. Definition Positive integer – a number greater than zero. 0123456.

Integers. Definition Positive integer – a number greater than zero. 0123456.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on statistics and probability pdf Ppt on service oriented architecture training Ppt on c language fundamentals grade Ppt on diode as rectifier circuit Ppt on solar system download Ppt on trial and error dvd Emergency dentist appt on saturday Ppt on electric meter testing model Download ppt on indus valley civilization art Ppt on air conditioning