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    1. What are the factors that Jerome can mark?
    2. How many points will Jerome earn for these factors?
    3. How many total points does Jerome have so far?
  2. How many points does Ming have so far?
  3. Jerome can only choose a number that has at least one unmarked factor left. Which numbers are left for Jerome to choose?

Play Factor 20 twice with a partner. As you play the game, think of strategies that will give you as many points as possible while also keeping your partner from scoring a lot of points.

  1. While playing the game a second time, think about the moves you and your partner make. Were you more successful in the second game? Describe any strategies you used or things you learned while playing the second time around.
  2. Which numbers were good choices for starting a turn? Why?
  3. Which numbers were not good choices for starting a turn? Why not?
  4. Did you notice any patterns? Which types of numbers were against the rules to choose?
  5. Which number(s) on a blank Factor 20 Game Board has the most factors? What are the factors?
  6. Which numbers (besides the number 1) have the fewest factors? What are the factors?
A prime number is a number with exactly two factors, one and itself. The numbers from the game board with the fewest factors that you listed for Question 6 should all be prime numbers.
A composite number is a number with more than 2 different factors. A composite number has factors other than one and itself.

Since the number 1 does not have 2 different factors, it is not considered prime or composite.

  1. Which numbers on a Factor 20 Game Board are composite numbers?