1. 7.4 Solving Multiplication and Division Equations
T/B pp

2. Activate! Brainstorm
What were the steps to solving addition and subtraction equations?
How do you think those steps will apply to today’s lesson?

3. Essential Question
How can inverse operations help you solve multiplication and division equations?

4. Think of other ways you might use this formula.
Activate!
Remember A=lw ??
What if…you have a rectangle that has an area of 24 ft2 and you know the length is 8 ft. How can you use this formula to find the missing width?
Think of other ways you might use this formula.

5. Vocabulary
To solve a multiplication problem, use the division property of equality:
Dividing each side of an equation by the same nonzero number produces an equivalent equation.
ax = b ax = b
a a

6. Solving a Multiplication Equation
7x = 63
Steps to Solve for a Variable:
Isolate the variable by using an inverse operation.
Divide each side by the same number.
(3) Simplify, if needed.
(4) Check your work!

7. Solving a Multiplication Equation
-11w = -132

8. On Your Own
9a = 45
-6b = 36
7 = 2c
-64 = -8f

9. Vocabulary: N/T Guide p. 151
To solve a division problem, use the multiplication property of equality:
Multiplying each side of an equation by the same nonzero number produces an equivalent equation.
x = b a * x = b * a
a a

10. Solving a Division Equation
x/4 = -7
Steps to Solve for a Variable:
Isolate the variable by using an inverse operation.
(2) Multiply each side by the same number.
(3) Simplify, if needed.
(4) Check your work!

11. Solving a Division Equation
b/-13 = -9

12. On Your Own II
(e) r/4 = 8
(f) y/3 = -15
(g) 1.5 = t/3

13. Solving an Equation Using a Reciprocal
2/7 x = 4
Steps to Solve for a Variable:
Isolate the variable by using an inverse operation. (remember rules for dividing w/ fractions)
(2) Multiply each side by the same reciprocal.
(3) Simplify, if needed.
(4) Check your work!

14. Solving an Equation Using a Reciprocal

15. On Your Own III
(h) 5/6 x = 5
(i) 3/4 y = -1
(j) 6 = 3/2 k

16. Ones: Tell twos how to solve 5x=15
Pair/Share
Ones: Tell twos how to solve 5x=15
Twos: Tell ones how to solve 1/5x=15

17. Extended Learning Opportunity Pizzazz pp. 73-74