Solution

24928

First name
Tobi Odunuga
School
Junior King's School,Canterbury
Age
11

What me and my partner did is figure out that the triangle has to be a multiple of three so that the horizontal line so the circles can be a multiple of three because they are three of them. we then worked through the three times table and found out that six would fit in

circle=4
triangle=6
hexagon=7
square=8