Solution

160434

First name
Freya and Merry
School
Reepham Primary
Country
Age
11

This is our solution:

This problem was an algorithm. This works because when doing the calculation you are working out the opposite and the middle part in the calculation always equals five. Also we worked out that doing the calculations backwards and using the opposite symbol also gives you five. This proves that you can do it in any order.
E.g
10x2=20
20-4=16
16/2=8
8-3=5