Factors, Prime Factors, HCF

Factors

100

List factors of 12

1,2,3,4,6 and 12

200

List factors of 18

1,2,3,6,9,18

300

List factors of 35

1,5,7,35

400

100

1,2,4,5,10,20,25,50,100

500

17

1, 17

Prime Factors

100

What are the prime factors of 12

2 x 2 x 3

200

What are the Prime Factors of 25

5 x 5

300

What are the prime factors of 100

2 x 2 x 5 x 5

400

What are the Prime factors of 180

2 x 2 x 3 x 3 x 5

500

What are the prime factors of 144

2x2x2x2x3x3

Highest Common Factor

100

12 and 16

4

200

35 and 49

7

300

26 and 65

13

400

32 and 80

16

500

144 and 100

2

Lowest Common Multiple

100

2 and 3

6

200

5 and 7

35

300

4 and 8

8

400

6 and 8

24

500

12 and 13

156

Worded Questions

100

Timer 1 is set to beep every 8 minutes. Timer 2 is set to beep every 6 minutes. How many times will they beep at the same time in 30 minutes?

1

200

You bring snacks for your cricket team every fifth game. Every third game is a home game. When will be the first time you bring snacks to a home game?

15th Game

300

Mr Bellerby is making shark tooth necklaces. He has 60 great white teeth and 72 reef shark teeth. What is the greatest number of identical necklaces he can make if he wants to use all of the teeth?

6

400

Three pigs entered a race around a track. Piggly takes 12 minutes to run one lap. Bacon takes 6 minutes to run one lap and it takes Oinky 16 minutes to run one lap. If all three pigs begin the race at the same time, how many minutes will it take for all three pigs to be at the starting point again?

48 minutes.

500

Jonny bakes 36 oatmeal cookies and 38 chocolate chip cookies to package into plastic containers for his friends at school. He wants to divide the cookies into identical containers so that each container has the same number of each kind of cookie. If he wants each container to have the greatest number of cookies possible, how many plastic containers does he need?

12 plastic containers