Multiplication as Repeated Subtraction
Presentation
•
Mathematics
•
6th - 8th Grade
•
Hard
Sarah Fox
FREE Resource
4 Slides • 14 Questions
1
by Sarah Fox
2
Subtracting integers sometimes requires us to add zero pairs (+ and -) in order to take away the right amount. (Throwing them in the garbage can.)
The image on the right would have a value of 8 after we subtract the two negatives.
3
Multiple Choice
4 - (-6)
-10
10
-2
2
4
Multiple Choice
4 - 6
10
-10
2
-2
5
Multiple Choice
-4 - 6
-10
10
2
-2
6
Multiple Choice
-4 - (-6)
10
-10
2
-2
7
Remember that multiplying is telling you how many groups there are.
Ex. 2(-4) is 2 groups of -4 which equals -8
Keep in mind that the negative (-) also means opposite.
Ex. -2(-4) is the OPPOSITE of 2(-4) so it equals 8 <--- Not negative!
8
Multiple Choice
3(-5)
-15
15
2
-2
9
Multiple Choice
-3(-5)
-15
15
2
-2
10
Multiple Choice
-3(5)
-15
15
2
-2
11
Multiple Choice
3(5)
-15
15
2
-2
12
Open Ended
How can you tell if the answer will be positive or negative when you multiply?
13
Sometimes we subtract the same thing a lot!
Ex. 10 - (-2) - (-2) - (-2)
Could be written in a simpler form using Multiplication.
10 - 3(-2)
Since we are subtracting 3 groups of -2.
14
Multiple Choice
5 - 3 - 3 - 3 - 3 - 3
5 - 5(-3)
5 - 5(3)
15
Multiple Choice
-7 - (-4) - (-4)
-7 - 2(-4)
-7 - 2(4)
16
Poll
5 - 4(-2)
5 - (-2) - (-2) - (-2) - (-2)
5 - 2 - 2 -2 -2
17
Multiple Choice
8 - 3(4)
8 - (-4) - (-4) - (-4)
8 - 4 - 4 - 4
18
Fill in the Blanks
Write -6 - 5 - 5 - 5 - 5 as multiplication.
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by Sarah Fox
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