2. Definitions or Terms You Need to Know
The number line goes on forever in both directions. This is
indicated by arrows.
Whole numbers greater than zero are called positive integers. These
numbers are to the right of zero on the number line.
Whole numbers less than zero are called negative integers. These
numbers are to the left of zero on the number line.
What I Know
Mrs. Glosser's Math Goodies 1998.
3. The integer zero is neutral. It is neither positive nor
negative.
The sign of an integer is either positive (+) or negative (-),
except zero, which has no sign.
Two integers are opposites if they are each the same distance away
from zero, but on opposite sides of the number line. One will have
a positive sign, the other a negative sign. In the number line
above, +3 and -3 are labeled as opposites. ( Glosser,1998)
4. The Integer Song
http://www.youtube.com/watch?v=8eRQprqEGmk
5. Using a Number Line
When adding one or more numbers you can use a number line.Watch the
following videos for a quick peekNumber Line:
http://www.goalfinder.com/product.asp?productid=139
Addition : http://youtu.be/dI5P4MPYazE
Subtraction: http://youtu.be/VZh6p3kUdyA
6. Adding Negative Integers
- Rule: The sum of two positive integers is a positive
integer.
Example 2: Find the sum of each pair of integers.
Do not confuse the sign of the integer with the operation being
performed. Remember that: +29 + +16 = +45 is read as positive 29
plus positive 16 equals positive 45.
Rule: The sum of two negative integers is a negative integer.
Example 1: Find the sum of each pair
of integers. You complete 2 and 3.
Do not confuse the sign of the integer with
the operation being performed. Remember
that: -2 + -9 = -11 is read as negative 2 plus
negative 9 equals negative 11.
Rules of Integer Addition
7. Your Turn
Select the link below for a quick practice to challenge your skills
of adding and subtracting Integers.You may use a separate sheet of
paper to use a number line if desired.
http://amby.com/educate/math/integ_x1.html
Duncan-Carr (2001)
8. Try out a Game
Deep Sea DuelOkta challenges you to a duel! That crazy octopus
wants to play you in a game where the first person to choose cards
with a specified sum wins. You can choose how many cards, what
types of numbers, and Okta's level of strategy. (NCTM 2011)
http://illuminations.nctm.org/ActivityDetail.aspx?ID=207
9. Integers with Two Color Counters
The link below will guide you through a short tutorial for using
two color counters. It will also review how perform the method
ofusing zero pairs.
http://youtu.be/jvWY3fC2e2M
10. Additional Practice
Integers & Operations with
Integershttp://www.ixl.com/math/grade-7
Math Drills Integershttp://www.math-drills.com/integers.shtml
Adding & Subtracting Integers
http://www.teaching-tools.com/math-worksheets/integers-worksheets/index.php
11. Quiz Time
Click on the link for a short assessment to determine how you have
mastered these
http://www.softschools.com/quizzes/math/adding_and_subtracting_integers/quiz1034.html
12. References
Duncan-Car, A.(2001). Integer Exercises with Signed Numbers.
Retrieved July 29, 2011 from;
http://amby.com/educate/math/integ_x1.html
Glosser, G.(1998).Math Goodies. Your Destination for Math
Education.Hyco, Inc. RetrievedJuly 28, 2011 from,
http://www.mathgoodies.com/lessons/vol5/intro_integers.html
Keeler, A. (2009) Adding and Subtracting Integer
Numbers.Teachertube.com. Retrieved July 30, 2011
from:http://www.youtube.com/watch?v=jvWY3fC2e2M&NR=1
Miller, M. (2009). Subtracting integers video - three models to
explain how subtraction of negative numbers works.Math Mammoth.
Retrieved July 28, 2011 from,
http://www.youtube.com/watch?v=Va_CiPK49vU
NCTM (2011). Deep Sea Dual. Illuminations, Resources for Teaching
Math. Retrieved July 29, 2011 from;
http://illuminations.nctm.org/ActivityDetail.aspx?ID=207
Unknown. (2010). Adding and Subtracting Integers. SoftSschhols.
Retrieved from;
http://www.softschools.com/quizzes/math/adding_and_subtracting_integers/quiz1034.html
Unknown. (2007). Integers on the Number Line, Math Software.
RetrievedJuly 28, 2011from
,http://www.goalfinder.com/product.asp?productid=139
