Prime Numbers
Which one of these numbers is a prime number?
7 or 39
7?
Which of these numbers is composite?
2, 3, 4
What are the factors for 16?
1, 2, 4, 8, 16
What do we call the numbers that you multiply together to get a product? For example, if 1 x 6 and 2 x 3 both equal 6, then 1, 2, 3, 6 are all __________ of 6.
Factors
Which one of these numbers is a prime number?
2 or 4
2
Anna wanted to know if 57 was prime. Anna finds that 19 x 3 = 57. Knowing that, is 57 prime?
No.
1,3,5,7
What do we call numbers that only have 2 factors, 1 and the number itself?
As in 11 only has two factors as only 1 x 11 = 11.
Prime
13 or 21
13
Which one is a composite number?
41 or 39
41
Which numbers are factors of 28?
1, 2, 3, 4, 6, 7, 12, 14
1, 2, 4, 7, 14
Is the number 1 considered prime, composite, or neither?
Neither. 1 only has 1 factor, as only 1 x 1 = 1. This means it is neither prime or composite.
Which one of these numbers is a prime number?
9, 10, or 11
11
Which ones is a composite number?
17, 18, or 19
18
Find all the factors for 42
1, 2, 3 6, 7, 14, 21, 42
What do we call numbers that have 3 or more factors? Example 36 has 1,2,3,4,6,9,12,18,36 as factors, so 36 is considered _____________________.
31 or 81
31
True or False: All even numbers (except 2) are composite numbers.
True.
What are the factors for 64
1, 2, 4, 8, 16, 32, 64
Simplify this fraction 12/16?
3/4