Variables and Expressions: multiplying and dividing

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Variables and Expressionsmultiplying and
dividing

• 1.2 cont

2
.

• The expression 2 x 5 can also be written as 2 5.
  There are several other ways you can write
  multiplication and division expressions.
• Multiplication 5n 5 n 5 x n
• ab a b a x b
• 3(7) 3 7 3 x 7
• Division x 4

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.
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x 4
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Example

• Evaluate 4n when n 6
• 4n 4(6)
• 24

substitute 6 for n
multiply
4
Example
z 2

• Evaluate when z 8
• 4

z 2
8 2
substitute 8 for z
divide
5
? YOUR TURN ?

• Evaluate the expression when s 5 and t 10
• 1) 9s
• 2) 18t
• 3)
• 4)

45
180
10
100 t
9
45 s
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Evaluate with 2 variables!

• Ice Hockey To find the number of points earned
  by a hockey player, you can evaluate the
  expression g a, where g is the number of goals
  scored and a is the number of assists. Find the
  number of points earned by a hockey player with
  12 goals and 29 assists.

7
Evaluate with 2 variables!

• Ice Hockey To find the number of points earned
  by a hockey player, you can evaluate the
  expression g a, where g is the number of goals
  scored and a is the number of assists. Find the
  number of points earned by a hockey player with
  12 goals and 29 assists.

8
Evaluate with 2 variables!

• Ice Hockey To find the number of points earned
  by a hockey player, you can evaluate the
  expression g a, where g is the number of goals
  scored and a is the number of assists. Find the
  number of points earned by a hockey player with
  12 goals and 29 assists.

9
Evaluate with 2 variables!

• Ice Hockey To find the number of points earned
  by a hockey player, you can evaluate the
  expression g a, where g is the number of goals
  scored and a is the number of assists. Find the
  number of points earned by a hockey player with
  12 goals and 29 assists.

10
Tell me what you know

• g a 12 29
• 41 add
• The answer is The hockey player earned 41
  points

substitute 12 for g and 29 for a
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? YOUR TURN ?

• Football To find the total number of points
  scored by the football team, you can evaluate the
  expression t x p, where t is the total touchdowns
  and p is the amount points per touchdown. Last
  season, the football team scored exactly 12
  touchdowns. If one touchdown is 7 points, how
  many total points did the football team score
  last season?

12
? YOUR TURN ?

• Football To find the total number of points
  scored by the football team, you can evaluate the
  expression t x p, where t is the total touchdowns
  and p is the amount points per touchdown. Last
  season, the football team scored exactly 12
  touchdowns. If one touchdown is 7 points, how
  many total points did the football team score
  last season?

13
Tell me what you know

• t x p 12 x 7
• 84
• The answer is The total number of points
  scored by the football team last season
  was 84 points

substitute 12 for t and 7 for p
multiply
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Thought of the day

• A cat has 32 muscles in each ear.