Transcript Prime Time Lesson 1.1: The Factor Game

Prime Time
Factors and Products
1.1 Playing the Factor Game
Vocabulary
• Factor: One of 2 or more whole numbers that are
multiplied to get a product.
• For Example, 13 and 4 are both factors of 52
because 13 x 4 = 52
• Divisor: A number that divides is a given number
leaving a zero remainder.
• For Example, 5 is a divisor of 20 since 20 ÷ 5 = 4
and has a remainder of 0. A divisor is also known
as a factor of that number. Another way to
determine if 5 is a divisor of 20 is to ask whether
there is a whole number that when multiplied by
5, gives 20. The number is 4. 5 x 4 = 20.
The Factor Game Board
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4
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Factor Game Rules
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Player A chooses a number on the game board and circles it.
Using a different color, Player B circles all the proper factors of
Player A’s number. The Proper Factors of a number are all the
factors of that number, except the number itself. For example, the
proper factors of 12 are 1, 2, 3, 4 and 6. Although 12 is a factor of
itself, it is not a proper factor.
Player B circles a new number, and Player A circles all the factors
of the number that are not already circled.
The players take turns choosing numbers and circling factors.
If a player circles a number that has no factors left that have not
been circled, then that player does not get the points for the
number circled and loses the next turn.
The game ends when there are no numbers left with uncircled
factors.
Each player adds the numbers that are circled with his or her
color. The player with the greater total is the winner.
Example Game
Cathy
Sara
24
36
Example Game
Cathy
Sara
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21
36
28
Example Game
Cathy
Sara
24
21
27
36
28
9
Example Game
Cathy
Sara
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21
27
30
36
28
9
30
Example Game
Cathy
Sara
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21
27
30
0
36
28
9
30
0
Practice, Practice, Practice!