**Koft operation** is a mathematical operation. In this operation, we use two numbers separated by a vertical score, multiplying these two numbers twice, each one adding square of the both numbers given at a time. Then we subtracting the two resulting numbers to reveal the answer.

For example, lets solve for 12|16. The first operation we write is (12×16)+12²=192+144=336. The second operation is (12×16)+16²=192+256=448. Then we subtract, 448−336=112. So the value of 12|16 is 112.

There is a faster, simpler way to solve it, by simply multiplying the sum and difference of these two numbers. For 12|16, the sum is 28 (since 12+16) and the difference is 4 (since 16−12). So we multiply 28×4=112. So 112 is the same answer as the more complex operation above.

The more complex operation is called the "time square operation", while the simpler operation is called the "hanging operation".

## Explanation Edit

The first operation, performed on , is . The second operation is . The difference of these two is , which is simply by the difference of two squares.