1. Stand Quietly

2. Lesson 3.4 Solving Equations using Multiplication or Division
Students will be able to apply multiplication or division to solve one step equation.

4. Textbook Big Idea Page 106 #3-23 ODD
Homework (12/7/16)
Textbook Big Idea Page 106 #3-23 ODD

5. 12. p= 2/3 2. ____ 4. ____ 6. z= 5 8. x= -18 10. w= -15.4 14. d= -5.9
Homework Solutions
12. p= 2/3
14. d= -5.9
16. x=
18. r= -1 9/20
20. k= -7 32/55
2. ____ 4. ____ 6. z= 5 8. x= w= -15.4

6. Multiply & Divide Equations
1) GOAL:
Get the variable on one side
of the equation.
2) You always perform the same operation to
both sides of an equation.
3) To undo an operation you perform its opposite operation to both sides of the equation.

7. Multiply & Divide Equations
The inverse of add is
SUBTRACT
The inverse of subtract is
ADD
The inverse of multiply is
DIVIDE
The inverse of divide is
MULTIPLY

8. Multiply & Divide Equations
What you do to one side of an equation, you must do to the other side to keep it balanced. =
-30
(-5)(6)
Or (5)(-6)

9. To solve a multiplication equation
Multiply & Divide Equations
To solve a multiplication equation
Use the inverse operation for multiplication which is division.
Get the variable alone, by dividing the same number into both sides.

10. Try to solve this multiplication equation.
Multiply & Divide Equations
Try to solve this multiplication equation.
How do you get x all by itself? = 8x
-56

11. Multiply & Divide Equations
Divide 8 into both sides. = 8x 56 -7 8 8

12. •-7 = 8x 56 Divide 8 into both sides.
Multiply & Divide Equations
Divide 8 into both sides.
Check your answer by substitution! = 8x
•-7 56

13. Try to solve this multiplication equation
Multiply & Divide Equations
Try to solve this multiplication equation
How do you get x all by itself? = 42
-7x

14. Multiply & Divide Equations
Divide 7 into both sides. = 42
-7x -6 -7 -7

15. •-6 Divide 7 into both sides. = 42 -7x
Multiply & Divide Equations
Divide 7 into both sides.
Check your answer by substitution! = 42
-7x
•-6

16. To Solve a Multiplication Equation
Multiply & Divide Equations
Divide the same number into both sides
To Solve a Multiplication Equation
8x = 32
Get the variable alone.
Divide 8 into both sides.
x = 4
8 divided by 8 cancels out
8 • 4 = 32
Show your check!
32 = 32
Finish your check!

17. Multiply & Divide Equations1) 3) 2) 4)

18. To solve a division equation
Multiply & Divide Equations
To solve a division equation
Use the inverse operation for division which is multiplication.
Get the variable alone, by multiplying the same number to both sides.

19. Try to solve this division equation
Multiply & Divide Equations
Try to solve this division equation
How do you get x all by itself? x 3 = 15

20. Multiply & Divide Equations
Multiply both sides by 3 x 3 = •3 45 •3 15

21. 45 x = 3 15 Multiply both sides by 3
Multiply & Divide Equations
Multiply both sides by 3
Check your answer by substitution! 45 x 3 = 15

22. Try to solve this division equation
Multiply & Divide Equations
Try to solve this division equation
How do you get x all by itself? x 6 = 4

23. Multiply & Divide Equations
Multiply both sides by 6 x 6 = •6 24 4 •6

24. 24 x = 6 4 Multiply both sides by 6 Check your answer by substitution!
Multiply & Divide Equations
Multiply both sides by 6
Check your answer by substitution! 24 x 6 = 4

25. Try to solve this division equation
Multiply & Divide Equations
Try to solve this division equation
How do you get x all by itself? x 7 = -7

26. Multiply & Divide Equations
Multiply both sides by 7 x 7 = •7
-49 -7 •7

27. -49 x = 7 -7 Multiply both sides by 7
Multiply & Divide Equations
Multiply both sides by 7
Check your answer by substitution!
-49 x 7 = -7

28. To Solve a Division Equation
Multiply & Divide Equations
To Solve a Division Equation
Multiply the same number to both sides.
x 3
= 25
Get the variable alone.
3• •3
= 25
x 3
Multiply both sides by 3.
3 divided by 3 cancels out to 1.
x = 75
Show your check!
Finish your check!
25 = 25

29. Try These Equations Show your check!
Multiply & Divide Equations
Try These Equations Show your check!
-3x = 21 m
= 8 -2
(-2)
m = -16
x = -7
-3(-7) = 21
21 = 21
8 = 8

30. Multiply & Divide Equations
Try These Equations 1) 2)

31. Multiply & Divide Equations
Try These Equations 3) 4)