Factors
• Learning Goal: Demonstrate an
understanding of factors of numbers less than
100
Kid friendly: Show that you can find the factors
of a number less than 100
What I think I know:
What is a factor?
• Factors are numbers you can multiply together
to get another number:
• Example: 2 and 3 are factors of 6, because 2 ×
3 = 6.
• A number can have MANY factors!
Factors of 12
• Example: What are the factors of 12?
• 2 x 6, 4 x 3, 1 x 12
• 1, 2, 3, 4, 6, 12
Points to Consider
What number is a factor of EVERY number?
1 is a factor of EVERY number
Strategies to find factors
• Rainbow method
• Factor Tree
• Table
• Graph paper
The Factor Game
• On your game card the numbers 1 – 30 are listed. The goal
of the game is to choose the numbers that have the most
amount of factors
• Rock, paper, scissors to determine which partner goes first
• On your turn, you may pick any number on the card. You
and your partner then need to find all of the factors of that
number.
– However many factors = your score for that round. Keep a
record of this on the side.
• You many only take 10 seconds each turn to choose your
number.
• The game is over when either the class time runs out, or
you have used all of the numbers on your card. You should
each have a final score.
To consider
• Do you think that it makes sense to split a day
into 24 hours?
– Would another number have been a better
choice?
• Why or why not?
Practice
Find the Greatest Common Factors (GCF)
between the numbers below. Use whichever
strategy you like. I would encourage you to try
using more than one!
1.
2.
3.
4.
28 and 52
120 and 80
36 and 49
32 and 20