Solution

155432

Problem / game
Hollow Squares Back to problem
School
East Marden Primary School
Country
Australia
Age
11

Times the bigger number (The outer number) By itself and subtract the smaller number(The inner number) squared and you find the answer, Eg:
a sixteen by sixteen square with a center of 8x8
16 x 16 8x8
256 - 64
192
the total area of the hollow square (16x16-8x8=192) has been calculated to be 192.