Listing the Factors or Multiples
List all the factors of 12.
Use an array and equations to show your work.
_ x _ = _
1 x 12 = 12 ************
2 x 6 = 12 ******
******
3 x 4 = 12 ****
****
****
What is a prime number?
A prime number is a number that only has 2 factors, 1 and itself.
Is 2 a common factor of 16 and 25?
no, only 2 x 8= 16.
What are the first three common multiples of 2 and 3?
6, 12, 18
List all the first four multiples of 7.
7, 14, 21, 28
Which of the following numbers are prime?
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
2, 3, 5, and 7
Is 3 a common factor of 15 and 27? Why or why not?
yes, 3 x 5 = 15 and 3 x 9 = 27
What are the first three common multiples of 4 and 5?
20, 40, 60
List all the factors of 36.
Write all equations and list the factors in order to show your work.
_ x _ = _ _, _, _, _, _
1 x 36 = 36
2 x 18 = 36
3 x 12 = 36
4 x 9 = 36
6 x 6 = 36
1, 2, 3, 4, 6, 9, 12, 18, 36
Is 17 a prime or composite number? Why?
Prime, because its factors are 1 x 17.
Is 5 a common factor of 75 and 60? Why or why not?
yes, 5 x 7 = 75 and 5 x 12 = 60.
What are the missing common multiples of 3 and 7?
_____, 42, _____, _______ ...
21, 42, 63, 84
List all the factors of 56.
Write all equations and list the factors in order to show your work.
_ x _ = _ _, _, _, _, _
1 x 56 = 56
2 x 28 = 56
4 x 14 = 56
7 x 8 =56
1, 2, 4, 7, 8, 14, 28, 56
Is 43 a prime or composite number? Why?
Prime, because its factors are 1 & 43.
Is 4 a common factor of 62 and 48? Why or why not?
no, only 4 x 12 = 48.
What are the missing common multiples of 6 and 8?
____, _____, 72, ______...
24, 48, 72, 96
List all the multiples of 6 up to 60.
6, 12, 18, 24, 30, 36, 42, 48, 54, 60
Is 93 a prime or composite number? Why?
Composite, because its factors are 1, 3, 31, 93.
Is 6 a common factor of 30 and 78? Why or why not?
Yes, 6 x 5 = 30 and 6 x 13 = 78.
What are the first four common multiples of 3, 4, and 6?
12, 24, 36, 48