Solving Multiplication and Division Equations

1
Solving Multiplication and Division Equations
1-4
Warm Up
Problem of the Day
Lesson Presentation
Pre-Algebra
2
Warm Up Solve.
2. 16 n 9
1. x ? 3 9
x 12
n 7
4. 47 t ? 19
3. 5 k 6
k 1
t 66
5. 15 x 2
x 13
3
Learn to solve equations using multiplication and
division.
Vocabulary
Division Property of Equality Multiplication
Property of Equality
4
You can divide both sides of an equation by the
same nonzero number, and the equation will still
be true.
4 3 12
x y
4 3 12
x y
2
2
z
z
5
Solve 8x 32.
8x 32
8
8
1x 4
x 4
6
Solve 9x 54.
9x 54
9
9
1x 6
x 6
7
You can multiply both sides of an equation by the
same number, and the statement will still be true.
2 3 6
x y
2 3 6
x y
8 3 24
8
Solve
n 49
9
Solve
n 64
10
Joe has enough flour to bake one sheet cake but
would rather make cookies. How many dozen cookies
can he make?
4 2 8
11
Joe has enough flour to bake one sheet cake but
would rather make cookies. How many dozen cookies
can he make?
1 batch of cookies 1 dozen
4 batches of cookies 4 dozen
Joe has enough flour to make 4 dozen cookies.
12
Evaluate the expression 3y 7 when y 10.

• Evaluate
• Multiply
• Subtract
• Solve
• Add
• Divide

3y 7
3(10) 7
30 7
23
Now, solve 3y 7 20.
13

• Solve
• Add
• Divide

Solve 3y 7 20.
3y 7 20
7 7
3y 27
3y 27 3 3
y 9
14

• Solve
• Subtract
• Divide

Solve 4y 5 29
4y 5 29
-5 -5
4y 24
4y 24 4 4
y 6
15
Homework

• Pg 21
• 1 43 odd