Pre Algebra Lesson 2 5
Transcript of Pre Algebra Lesson 2 5
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 1/29
Subtracting Integers
Objective: Subtract integers
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 2/29
5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 3/29
5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a a = -7
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 4/29
5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
2. b = 2 + (-6)
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 5/29
5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
2. b = 2 + (-6) b = -4
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 6/29
5-Minute Check
Solve for the unknown in each equation.
1. – 4 + (-3) = a
2. b = 2 + (-6)
3. -1 + 4 + (-6) = c
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 7/29
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
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 8/29
5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 9/29
5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x -5x
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 10/29
5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x
5. -2x + (-6x) + (-5x)
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 11/29
5-Minute Check
Simplify each expression.
4. 15x + (-22x) + 2x
5. -2x + (-6x) + (-5x) -13x
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 12/29
Subtracting Integers
Subtracting IntegersTo subtract an integer, add its additive inverse.
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 13/29
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 14/29
Subtracting Integers
Example
Solve each equation.
a. n = 6 – (-4)
n = 6 –
(-4) To subtract –
4, add 4
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 15/29
Subtracting Integers
Example
Solve each equation.
a. n = 6 – (-4)
n = 6 –
(-4) To subtract –
4, add 4n = 6 + 4
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 16/29
Subtracting Integers
Example
Solve each equation.
a. n = 6 – (-4)
n = 6 –
(-4) To subtract –
4, add 4n = 6 + 4
n = 10
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 17/29
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 18/29
Subtracting Integers
Example
Solve each equation.
b. (-3) – (-7) = y
(-3) –
(-7) = y To subtract –
7, add 7
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 19/29
Subtracting Integers
Example
Solve each equation.
b. (-3) – (-7) = y
(-3) –
(-7) = y To subtract –
7, add 7(-3) + 7 = y
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 20/29
Subtracting Integers
Example
Solve each equation.
b. (-3) – (-7) = y
(-3) –
(-7) = y To subtract –
7, add 7(-3) + 7 = y
4 = y
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 21/29
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 22/29
Subtracting Integers
Example
Solve each equation.
c. (-11) – 5 = u
(-11) –
5 = u To subtract 5, add –
5
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 23/29
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 24/29
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 25/29
Subtracting Integers
Example
Solve each equation.
d. x = 13 – 15
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 26/29
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 27/29
Subtracting Integers
Example
Solve each equation.
d. x = 13 – 15
x = 13 –
15 To subtract 15, add –
15x = 13 + (-15)
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 28/29
Subtracting Integers
Example
Solve each equation.
d. x = 13 – 15
x = 13 –
15 To subtract 15, add –
15x = 13 + (-15)
x = -2
7/22/2019 Pre Algebra Lesson 2 5
http://slidepdf.com/reader/full/pre-algebra-lesson-2-5 29/29
Subtracting Integers
As a class, create a model for subtracting integers.