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Integer Discussion
Board
+ , -
Let’s talk addition…
»What are some strategies to solve integer addition problems like
-14 + 37 ?
With your partner…
• Come up with two ways of finding the answer to that problem.
• I will choose a student at random to
share out.
Using a
number
line
Remember the ruleRemember the rule
SCOREBOARD !SCOREBOARD !
Use a number line!
-14 + 37
0 10 20 30 40-10-20-30-40 50-50
origin
-14 + 37 What rule applies here, SAME signs or DIFFERENT signs?
Different signs- subtract- take the sign of the “bigger” number
RULERULE
Shout out inShout out in
+ --14 + 37
37 14
Who won? The + Team!By how much?
37-1423By 23 points
Answer: +23
SCOREBOARD
What about Subtraction?
» Herman solved -22 - -14 the following way:
-22 - -14 = -22 + -14= -36
Is this correct?
So the correct way is…
The wrong
step was…
Then what is right..
Partner B:Partner A:
The Missing Link
Herman remembered subtraction is the same as addition kind of…. But forgot the most important part!
Subtracting is the same as adding the OPPOSITE
-22 - (-14)adding
the opposite
“add a line change the sign”Or
“boom boom”
Write in the summary section of your notes:
What do you do to solve 15-28 (write in words)?
Solve it!
Click to go to solution
15 - 28adding
the opposite
Shout out Shout out answer inanswer in
Closure #2
Write in your notes...Write in your notes...
which method you will use to add and subtract with + and - integers.
