Prime Numbers
What is a Prime Number?
A prime number has exactly two factors. The number 1 and itself.
What is a composite number?
A composite number has more than two factors.
What is 4 x 6?
24
How do you find a multiple?
To find a multiple, you have to skip count by that number. Example- (3, 6, 9, 12, 15)
What is a factor?
A factor is a number that is multiplied by another number to find a product. Example- 16 factors are 1,2,4,8,16.
Is 19 a prime number? Why or why not?
19 is a prime number has exactly two factors. 1 and 19
Is the number 51 a prime number or a composite number?
51 is a composite number. 1, 3, 17, 51
What is the product of 4 and 9?
36
The numbers 28, 35, 42, 49 and 56 are all multiples of which number?
7
What are the factors of 24?
1, 2, 3, 4, 6, 8, 12, 24
What are the factors of 53?
There are none, 53 is a prime number.
What are the even composite numbers from 1-30?
2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30.
12 x 12?
144
What are the even multiples of 7 up 70.
7, 14, 28, 42, 56, 70
What are the factors of 56?
Factors of 56: 1, 2, 4, 7, 8, 14, 28 and 56.
Which of these numbers are prime numbers 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29?
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Which of these numbers are composite 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15?
4, 6, 8, 9, 10, 12, 14, 15
What is 70 x 9?
630
Name the odd multiples of 6 up to 40.
There are none.
What are the factors of 211?
1 and 211
What are the multiples of 20 up to 90?
20, 40, 60, 80
What are the factors of 20 up to 90?
20, 40, 60, 80