Oct 22 Integers
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October 22, 2008 © 2004 SMART Technologies Inc. All rights reserved. For further information, please seecopyright notice . How to use Notebook(TM) software Learn helpful tips and tricks for developing and presenting lesson activities. Teacher Notes Subject: Maths Topic: Number operations Title: Addition of Integers Year Group(s): 7, 8 and 9 Curriculum-related themes: Non-specific Intended learning outcome(s) · Learn the rules for adding integers · Gain practice adding integers Recommended usage: Introduction / main activity
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Transcript of Oct 22 Integers
October 22, 2008
© 2004 SMART Technologies Inc. All rights reserved. For further information, please see copyright notice.
How to use Notebook(TM) softwareLearn helpful tips and tricks for developing and presenting lesson activities.
Teacher Notes
Subject: Maths
Topic: Number operations
Title: Addition of Integers
Year Group(s): 7, 8 and 9 Curriculum-related themes: Non-specific
Intended learning outcome(s)· Learn the rules for adding integers· Gain practice adding integers
Recommended usage: Introduction / main activity
October 22, 2008
Addition of Integers
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
Submitted by: Gerry-Lynn BorysRed Deer Catholic Regional Division: St.Patrick's Community School
Windows(R) operating system and Mac OS X operating system software
October 22, 2008
means + 1
means -1
You can use algebra tiles to add integers.
October 22, 2008
This is the same as saying (+3) + (-2) = +1
This is the same as saying(+2) + (-4) = -2
Example
=+1 = -2
October 22, 2008
The zero principle states that when you add two opposites, their sum is equal to zero.
Zero principle
(+1) + (-1) = 0
October 22, 2008
left with +1
left with -2
So, in our two examples
=0 =0 =0 =0
October 22, 2008
Use the yellow (positive) tiles and red (negative)tiles to add each pair of integers, then write the addition sentence for each.
(+5) + (-4)
(+3) + (-7)
(-4) + (-3)
October 22, 2008
Answers
(+5) + (-4)
(+3) + (-7)
(-4) + (-3)
October 22, 2008
You can also use a number line to add integers.
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
(+3) + (-2) Start at +3 and move back 2 spaces
+ sign means move forward or to the right of zero - sign means move back or to the left of zero
October 22, 2008
Solve the following questions using the number line.
(-3) + (-2)
(+5 ) + (-6)
(-7) + (+4)
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
October 22, 2008
Answers
(-3) + (-2)
(+5 ) + (-6)
(-7) + (+4)
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
October 22, 2008
You can also add integers algebraically.
Simply ignore the addition sign and do what the sign on the second integer tells you to do.
Example (+4) + (-5)
Ignore the addition sign and this question becomes
4 - 5 = -1
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October 22, 2008
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October 22, 2008
(+4) + (-3)= _____
(-3) + (+6)= _____
(+5) + (+2)= _____
(-2) + (-5) = _____
(-4) + (+2)= _____
+1
+3
+7
-7
-2
