pre algebra lesson 2 5
TRANSCRIPT
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Subtracting Integers
Objective: Subtract integers
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5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
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5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a a = -7
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5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
2. b = 2 + (-6)
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5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
2. b = 2 + (-6) b = -4
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5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
2. b = 2 + (-6)
3. -1 + 4 + (-6) = c
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5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
2. b = 2 + (-6)
3. -1 + 4 + (-6) = c c = -3
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5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x
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5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x -5x
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5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x
5. -2x + (-6x) + (-5x)
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5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x
5. -2x + (-6x) + (-5x) -13x
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Subtracting Integers
Subtracting IntegersTo subtract an integer, add its additive inverse.
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Subtracting Integers
Example
Solve each equation.
a. n = 6 – (-4)
n = 6 –
(-4) To subtract –
4, add 4
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Subtracting Integers
Example
Solve each equation.
a. n = 6 – (-4)
n = 6 –
(-4) To subtract –
4, add 4n = 6 + 4
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Subtracting Integers
Example
Solve each equation.
a. n = 6 – (-4)
n = 6 –
(-4) To subtract –
4, add 4n = 6 + 4
n = 10
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Subtracting Integers
Example
Solve each equation.
b. (-3) – (-7) = y
(-3) –
(-7) = y To subtract –
7, add 7
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Subtracting Integers
Example
Solve each equation.
b. (-3) – (-7) = y
(-3) –
(-7) = y To subtract –
7, add 7(-3) + 7 = y
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Subtracting Integers
Example
Solve each equation.
b. (-3) – (-7) = y
(-3) –
(-7) = y To subtract –
7, add 7(-3) + 7 = y
4 = y
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Subtracting Integers
Example
Solve each equation.
c. (-11) – 5 = u
(-11) –
5 = u To subtract 5, add –
5
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Subtracting Integers
Example
Solve each equation.
d. x = 13 – 15
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Subtracting Integers
Example
Solve each equation.
d. x = 13 – 15
x = 13 –
15 To subtract 15, add –
15x = 13 + (-15)
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Subtracting Integers
Example
Solve each equation.
d. x = 13 – 15
x = 13 –
15 To subtract 15, add –
15x = 13 + (-15)
x = -2
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Subtracting Integers
As a class, create a model for subtracting integers.