Well done to everybody who had a go at this activity.

Kevin and Aurelius from Kingswood College School in Australia sent in this picture and explanation:

A We chose 4/4 because the numbers are the 2x table.

B We chose 2/3 because the top number 2 comes between 1 and 3 and 3 comes between 2 and 4.

C We chose 3 up the top because it comes between 2 and 4. We chose 5 down the bottom because it comes between 6 and 4.

D We chose 1 because all the top numbers are the same and chose 4 because the bottom numbers are the 2 x table.

E The top numbers are the 1x table going down so we chose 2. The bottom numbers are adding 1 each time.

F The top numbers are going down in 1s. The bottom numbers are going down in 1s.

G We chose 3 because it comes between the 4 and the 2. We chose 5 because it comes between 6 and 4. The numbers are going down in 1s.

H We chose 2 because the top numbers are going down in 1s and we chose 4 because it the bottom numbers are going down by 2s.

Well done to both of you for sending in these very clear explanations!

I wonder if there are any other possible solutions? If you've found anything different, please let us know by emailing us with your ideas.