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Prime numbers
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Divisibility Rules
Use the divisibility rules
Prime Factor trees
100

List the prime numbers in this set:

1,2, 3,4,5,6,7,8,9,10

1,2,3,5,7,9

100

Write a factor list for the number:

7

1,7

100

What is the divisibility rule for 2

the last digits is even (0,2,4,6,8)

100
Which numbers are divisible by 2


70,71,72,73,74,75,76,77,78,79,80

70, 72, 74, 76, 78, 80

100

make a prime factor tree for the number 10

                10

             5       2

2x5

200

List the prime numbers in this set:

11,12,13,14,15,16,17,18,19,20

11,13,17,19

200

Write a factor list for the number: 15

1,3,5,15

200

What is the divisibility rule for 3

the sum of the digits is divisible by 3

200

Which numbers are divisible by 5?

75,78,79,80,82,84,85,88,90,91,95

75,80,85,90,95

200

make a prime factor tree for the number 12

                      12

                  3        4

                          2    2

2x2x3

300

List the prime numbers in this set:

35,36,37,38,39,40,41,42,43,51,52,53,54,55,

37,41,43,53

300

Write a factor list for the number: 24

1,2,3,4,6,8,12,24

300

What is the divisibility rule for 6

If it is divisible by 2 and 3 you get 6 for free

300

Which numbers are divisible by 10

10,12,50,59,80,90,119,120,132,230,555,900,1,230

10 ,50, 80, 90, 120, 230, 900, 1,230,

300

make a prime factor tree for the number 16

                       16

                 4            4

               2   2        2    2

2x2x2x2

400

List the prime numbers in this set:

70,71,72,73,74,75,81,82,83,84,85,89,90,91

71,73,79,83,89

400

Write a factor list for the number: 64

1,2,4,8,16,32,64

400

What is the divisibility rule for 5 and 10

5: the last digit is 0 or 5

10: the last digit is 0

400

Which numbers are divisible by 3

70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85

72,75,78,81,84

400

make a prime factor tree for the number  64

                 64

                8         8

             4    2    2    4

           2   2           2   2

2x2x2x2x2x2