How many…

1. Feet in a mile?

2. Inches in a foot?

3. Inches in a mile?

4. Minutes in an hour?

5. Seconds in an hour?

Warmups

52801263,360603600

Homework Questions?

Pg. 669 # 13 – 31 odd

12-2 Multiplying Rational Expressions

Objective: To use rational expressions as conversion

factors

Standard 13.0

Example 1

Convert 32 ft/sec to mph

(“per” means divide)

32 1 60sec 60min 115200

1sec 5280 1min 1 5280

feet mile mile

feet hour hour

21.81 /mile hour

Speaker and scribe

1. Find a partner.

2. Partners decide who is A and who is B

3. A gets board, sock, and marker

4. B moves desk

5. 1 minute… GO!

12-1 Simplifying Rational Expressions Review (whiteboards)

2

3

12

27

x yz

xy2

4

9

xz

y

2

4 8

12 20

x

x x

4

10x

12-1 Simplifying Rational Expressions Review (whiteboards)

( 9)( 8)

( 8)( 9)

x x

x x

8

8

x

x

2

8 64

13 40

x

x x

8

5x

12-1 Simplifying Rational Expressions Review (whiteboards)

25 10

25 10

x

x

5 2

5 2

x

x

2

2

144

24 144

x

x x

12

12

x

x

12-2 Multiplying Rational Expressions Review (whiteboards)

2

3

6

7 18

x y

y 21

x

y

2

14 4

16 7

x

x

2

4x

12-2 Multiplying Rational Expressions Review (whiteboards)

5 15 3 9

10 30 7 21

x x

x x

3( 3)

14( 3)

x

x

2

2

6 5 3

4 5

x x x

x x

3( 1)

4

x

x

Mixed Review (whiteboards)

3 2

2

72

2 12 54

x x x

x x

( 8)

2( 3)

x x

x

7 21 10 30

3 9 5 15

x x

x x

14( 3)

3( 3)

x

x

Homework

Multiplying Rational Expressions Worksheet Quiz Tomorrow!

Math Lab Warmups

3 2

2

72

2 12 54

x x x

x x

( 8)

2( 3)

x x

x

7 21 10 30

3 9 5 15

x x

x x

14( 3)

3( 3)

x

x