Finding Factors
1, 2, 3, and 6
List the first five multiples of 2.
2, 4, 6, 8, and 10
What is a factor pair? Give an example...
A set of whole numbers that when multiplied together will result in a given product.
Example: The set 2 and 3 is a factor pair of 6
Make a factor tree to find all of the factor pairs of 10.
1 and 10
2 and 5
Is 9 prime or composite? Why?
9 is composite because it has more than 1 factor pair.
1 and 9
3 and 3
List the factors of 16.
1, 2, 4, 8, and 16
List the first five multiples of 5.
5, 10, 15, 20, 25
What are factors? Give an example...
Factors are whole numbers that are multiplied to get a product.
Example: 2 and 3 are factors of 6.
Make a factor tree to find all of the factor pairs of 12.
1 and 12
2 and 6
3 and 4
Is 21 prime or composite? Why?
21 is composite because it has more than one factor pair.
1 and 21
3 and 7
List the factors of 28.
1, 2, 4, 7, 14, and 28
List the first 5 multiples of 12.
12, 24, 36, 48, 60
What is a multiple? Give an example...
A multiple is the product of a whole number and any other whole number.
15 is a multiple of 5.
Make a factor tree to find all of the factor pairs of 24.
1 and 24
2 and 12
3 and 8
4 and 6
Is 26 prime or composite? Why?
26 is a composite number because it has more than one factor pair.
1 and 26
2 and 13
What is 20 a factor of? Give 3 examples.
40, 60, and 80
What is 20 a multiple of?
1, 2, 4, 5, 10, and 20
There are 40 students. The students can sit at tables of 6 or tables of 8. What size table should be used? Why?
Tables of 8 because 8 x 5 = 40.
Make a factor tree to find all of the factor pairs of 32.
1 and 32
2 and 16
4 and 8
Is 19 a prime or a composite number? Why?
19 is a prime number because it has only one factor pair.
1 and 19
What is 25 a factor of? Give three examples...
50, 75, and 100
What is 50 a multiple of?
1, 2, 5, 10, 25, and 50
There are 84 students. They can sit at tables of 12 or tables of 14. Which table should be used if we want to use the fewest tables possible?
Tables of 14 because 14 x 6 = 84 whereas 12 x 7 = 84. We would use one less table if we used tables of 14.
Make a factor tree to find all of the factor pairs of 40.
1 and 40
2 and 20
4 and 10
5 and 8
Is 33 a prime or a composite number? Why?
33 is a composite number because it has more than one factor pair.
1 and 33
3 and 11