preparation for geometry’s journey tuesday, august 19
TRANSCRIPT
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Preparation for Geometry’s Journey
Tuesday, August 19
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Adding and Subtracting Integers
• If the numbers have the same signs,– keep the signs and add the numbers
• If the numbers have different signs,– subtract the numbers and keep the sign
from the largest number.
7 + 2 -7 + -2 -7 – 2
7 – 2 7 + -2 -7 + 2 2 – 7
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-9 + -6
A. -15
B. 15
C. -3
D. 3
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-8 + 2
A. -10
B. 10
C. -6
D. 6
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-1 + 3
A. -4
B. 4
C. -2
D. 2
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4 + -10
A. -14
B. 14
C. -6
D. 6
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14 + -9
A. -23
B. 23
C. -5
D. 5
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Remember subtracting a negative
is the same as adding a positive
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-9 – -6
A. -15
B. 15
C. -3
D. 3
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-8 – 2
A. -10
B. 10
C. -6
D. 6
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-1 – 3
A. -4
B. 4
C. -2
D. 2
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4 – -10
A. -14
B. 14
C. -6
D. 6
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4 – 10
A. -14
B. 14
C. -6
D. 6
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-3 – -3
A. 0
B. 9
C. -6
D. 6
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When adding or subtracting more than two numbers…
ALWAYS GO LEFT TO RIGHT
7 + 2 + -13
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Subtract signs are attached to their number like negatives.
7 – 2 + 12 + -3
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4 – 10 + 8
A. -14
B. 14
C. 2
D. 2
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Adding Integers Practice
Attach worksheet into your notebook.
If it has more than 2 numbers, show what your first step is.
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Multiplying & Dividing Integers
• If the signs are the same,– then the answer is positive.
• If the signs are different,– then the answer is negative.
7 x -2 -7(2) -6 ÷ 2 6/-2
7 x 2 (-7)(-2) -6/-2 6÷2
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Multiplying Integers Practice
Attach worksheet into your notebook.
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Probability Basics
• Top Number – number of the specific thing
• Bottom Number – total number of items
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8 red dots, 11 green dots
• Probability of getting green
As a fraction
As a decimal
As a percent
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8 red dots, 11 green dots
• Probability of getting red
As a fraction
As a decimal
As a percent
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Probability Practice
Attach worksheet into your notebook.