subtraction of integers jaime cook grand canyon university tec 539
TRANSCRIPT
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Subtraction of Integers
Jaime CookGrand Canyon University
Tec 539
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Arizona Academic Standards
Arizona Mathematics Standards Articulated by Grade Level: Grade 7
Strand 1: Number and Operations
It includes an awareness of the different types of numbers such as, whole numbers, integers, fractions, and decimals and the relationships
Concept 2: Numerical Operations Understand and apply numerical operations and their relationship to one another.
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Students are expected to…
Add, Subtract, Multiple, and Divide Integers.
Recognize and convert between expressions for positive and negative rational numbers, including fractions, decimals, percents, and ratios.
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Words to know…Positive number-numbers that are to the right
of zero on the number line. (Example: 5)
Negative numbers- numbers to the left of the zero on the number line. (Example -4)
Double negative- two negatives in a number sentence. (Example: 7- (-3)
Opposite numbers- two numbers that are the same distance from zero on a number line. (Example:(-8) is an opposite number from +8 (or 8), and 5 is the opposite of (-5).
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Subtracting Positive and Negative Integers
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Subtracting Positive Integers
5 − 8
1. Start at the positive number 5.2. Move 8 units to the left.3. End at the number -3.
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Subtracting Negative Integers -4 − (-8)
1. Start at -4 on the number line.2. You would be ready to move 8 units to the left, but the second minus sign reverses your direction.3. Instead, you move 8 units to the right, ending at 4. (Hint: double negative, add the opposite)
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Subtracting Positive and Negative Integers
-1 − 3
1. Start at -1 on the number line.
2. Move 3 units to the left.
3. End at -4.
(This is identical to interpreting the addition -1 + (-3) on the number line.)
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Watch This!http://www.youtube.com/watch?v=Va_CiPK49vU&feature=
player_embedded
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Practice3 – 5 = ____
(-2) – (-3) = ____
1 - (-3) = ____
-2 – 2 = ____
(-5) - (-8) = ____
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Check3 – 5 = -2
(-2) – (-3) = 0
1 - (-3) = 5
-2 – 2 = -4
(-5) - (-8) = 3