Prime Numbers
Is 1 a prime number?
NO!
Is 1 a composite number?
NO!
What are all of the factors of 6?
1, 2, 3, 6
What are the factor pairs of 6?
2x3 and 1x6
List the first 3 multiples of 2.
2, 4, 6
Which number is prime: 5 or 9?
5 because it only has one factor pair, which is 5x1
Which number is composite, 12 or 13?
12 becuase it has more than one factor pair. They are 12x1 and 4x3
How many factors does 9 have?
Three factors. 1, 3, 9
What are the factor pairs of 10?
2x5 and 1x10
List the first 4 multiples of 5.
5, 10, 15, 20
Is 23 a prime number?
Yes
Is 27 a composite number?
Yes
How many factors does 12 have?
6 factors. 1, 2, 3, 4, 6, 12
What are the factor pairs of 16?
16x1 and 6x3 and 8x2
What is one strategy we can use to find multiples of a number?
Skip count
List the prime numbers between 1-10 (hint: there are 4)
2, 3, 5, 7
List the composite numbers between 1-10 (hint: there are 5)
4, 6, 8, 9, 10
List all the factors of 18.
1, 2, 3, 6, 9, 18
What are the factor pairs of 30?
30x1 and 5x6 and 3x10
Is 21 a multiple of 7?
Yes. 7x3 is 21.
List the prime numbers between 11-16 (hint: there are four)
List the composite numbers between 11-16 (hint: there are 4)
12, 14, 15, 16
How many factors does 16 have?
Five factors. 1, 2, 4, 8, 16.
Sean wants to separate his 30 Pokemon cards into separate piles. He can separate them in piles of 3, 5, 10, or 30. How many piles could he have with each of these amount of Pokemon cards in each pile?
3x10 or 10 piles of 3
5x6 or 6 piles of 5
30x1 or 1 pile of 30
What do these numbers have in common:
2, 4, 6, 8, 10
They are multiples of 2