Math Unit 1: Factors and multiples

Multiples

100

What are the first 5 multiples of 3

3,6,9,12,15

200

Is 28 a multiple of 6? Explain

No. You can not times 6 by any number to make 28.
Draw an array.

300

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

400

What is the 4 multiple of 9?

36

9,18,27,36

500

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,........)

Factors

100

What are the factors of 12

12

1x12
2x6
3x4

200

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

300

Select all the factors of 40 below

__2

__3

__4

__5

__20

__44

__80

2,4,5,20

400

What are all the factors of 60

1x60
2x30
3x20
4x15 (tough one)
5x12
6x10

500

Select all the factors of 23 below

__1

__2

__3

__6

__13

__23

1, 23

Prime/Composite

100

What number is neither prime or composite?

1

200

What is the definition of a Prime number?

The factors are 1 and itself

ex, 13:  1x13

300

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

400

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

A) is made up of all even numbers

and

 

D) all multiples of 5

500

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