Prime numbers
List the prime numbers in this set:
1,2, 3,4,5,6,7,8,9,10
1,2,3,5,7,9
Write a factor list for the number:
7
1,7
What is the divisibility rule for 2
the last digits is even (0,2,4,6,8)
70,71,72,73,74,75,76,77,78,79,80
70, 72, 74, 76, 78, 80
make a prime factor tree for the number 10
10
5 2
2x5
List the prime numbers in this set:
11,12,13,14,15,16,17,18,19,20
11,13,17,19
Write a factor list for the number: 15
1,3,5,15
What is the divisibility rule for 3
the sum of the digits is divisible by 3
Which numbers are divisible by 5?
75,78,79,80,82,84,85,88,90,91,95
75,80,85,90,95
make a prime factor tree for the number 12
12
3 4
2 2
2x2x3
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
Write a factor list for the number: 24
1,2,3,4,6,8,12,24
What is the divisibility rule for 6
If it is divisible by 2 and 3 you get 6 for free
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,
make a prime factor tree for the number 16
16
4 4
2 2 2 2
2x2x2x2
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
Write a factor list for the number: 64
1,2,4,8,16,32,64
What is the divisibility rule for 5 and 10
5: the last digit is 0 or 5
10: the last digit is 0
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
make a prime factor tree for the number 64
64
8 8
4 2 2 4
2 2 2 2
2x2x2x2x2x2