Factors
Name one factor of the number 12
1, 2, 3, 4, 6, 12
List two multiples of 4
4, 8, 12, 16, 20....
What is a prime number? (Bonus points if your team can name one prime number).
A number that only has one factor pair: one and the number itself.
What is a composite number?
A number that has more than one factor pair.
Draw any array on your team's whiteboard.
Use any shape to show columns and rows!
Name a factor pair of the number 20
1 and 20
2 and 10
5 and 4
List 5 multiples of 6
6, 12, 18, 24, 30, 36, 42, 48, ...
Is 3 a prime number?
Yes. It only has a factor pair of 1 x 3
Is 6 a composite number? Why or why not?
Yes, because it has more than one factor pair (1 x 6 AND 2 x 3).
Draw an array to show one factor pair of 10 on your team's whiteboard. (Extra points if you can draw two).
X X X X X X X X X X
AND/OR
X X X X X
X X X X X
Is 7 a factor of 60?
No.
Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Is 900 a multiple of 100?
Yes.
Is 9 a prime number?
No, it has factor pairs of 3 x 3, AND 1 x 9.
Is 40 a composite number?
Yes, because it has more than one factor pair.
Draw two different arrays to show 2 factor pairs for the number 24.
X X X X X X X X X X X X X X X X X X X X X X X X
AND
X X X X X X X X X X X X
X X X X X X X X X X X X
AND
X X X X X X
X X X X X X
X X X X X X
X X X X X X
AND
X X X X X X X X
X X X X X X X X
X X X X X X X X
List all the factors of the number 36.
1, 2, 3, 4, 6, 9, 12, 18, 36
Skip count by 6s from 6 to 60
6, 12, 18, 24, 30, 36, 42, 48, 54, 60
List three prime numbers
1, 2, 3, 5, 7, 11, 13...
Is 2 a composite number?
No. It's only factor pair is 1 x 2
Draw arrays for all the factor pairs of 12.
X X X X X X X X X X X X
AND
X X X X X X
X X X X X X
AND
X X X X
X X X X
X X X X
List all the factors of the number 60
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Skip count by 12s from 12 to 144
12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144
Is 19 a prime number?
Is 1,570 a composite number?
Yes. We know that at least 2, 5, and 10 are factors because the number ends in a zero.
Draw arrays for all the factor pairs of 16.
X X X X X X X X X X X X X X X X
AND
X X X X X X X X
X X X X X X X X
AND
X X X X
X X X X
X X X X
X X X X