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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
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