Solution

160465

Problem / game
Surprising Split Back to problem
First name
Kyla
School
Glendenning Public School
Country
Australia
Age
10

It works on multiples of 11 because they are using split strategy, and split stragtegy can also work like multiplying when it comes to multiples of 11. It always works because 11 is the same with both digits. In the middle of the number it's always going to be the double of the outer numbers because it is multiplied by 11.