I'm thinking of a number.

12 is a factor of my number.

What other factors MUST my number

have?

How many factors of

1 x 2 x 3 x 4 x 5 x 6

can you name without working out what

number it is?

1 x 2 x 3 x 4 x 5 x 6

Would you predict that 9 would be a

factor of this number?

1 x 2 x 3 x 4 x 5 x 6 =

1 x 2 x 3 x 2 x 2 x 5 x 2 x 3

How does this help us see that 9 is a

factor?

What factors do

2 x 3 x 4 x 5 x 6and

5 x 7 x 9

have in common?

What factors do

3 x 7 x 8 x 9 and

2 x 3 x 6 x 9

have in common?

What factors do

5 x 9 x 10 and200

have in common?