Multiples
What are the first 5 multiples of 3
3,6,9,12,15
What are the factors of 12
12
1x12
2x6
3x4
What number is neither prime or composite?
1
Is 28 a multiple of 6? Explain
No. You can not times 6 by any number to make 28.
Draw an array.
Which list is all the factors of 24?
a) 2,4,8,16,24
b) 2,3,8,9,12,24
c) 1,2,3,4,6,8,12,24
d) 1,2,4,6,8,12,24
c) 1,2,3,4,6,8,12,24
Draw an Array
What is the definition of a Prime number?
The factors are 1 and itself
ex, 13: 1x13
Which list below shows the multiples of 8?
a) 1,2,4,8
b) 2,4,6,8
c) 8,32,56,72
d) 8,16,24,32,40
d) skip count by 8
Select all the factors of 40 below
__2
__3
__4
__5
__20
__44
__80
2,4,5,20
Which list shows prime numbers
A) 1,3,5,7,13
B) 2,3,13,17,31
C) 3,5,7,11,15
D) 1,3,5,7,9,11
A) is wrong because 1 is niether Prime or composite
C) is wrong because 15 is composite 3x5
D) is wrong because 9 is composite 3x3
Ans. B
What is the 4 multiple of 9?
36
9,18,27,36
What are all the factors of 60
1x60
2x30
3x20
4x15 (tough one)
5x12
6x10
Which lists shows all composite numbers?
A) 2,4,6,8,10,26,48
B) 6,17,21,49,63,81
C) 1,6,9,15,18,22
D) 5,15,45,100,120
D) all multiples of 5
Select all the multiples of 9
_3
_18
_21
_54
_82
18 (2x9)
54 (6x9)
(9,18,27,36,45,54,63,72,81,90,........)
Select all the factors of 23 below
__1
__2
__3
__6
__13
__23
1, 23
Is 2,395,432 Prime or composite? How do you know?
Composite, it ends in a 2 which makes it an even number. All even numbers except the number 2 are composite numbers