To find the percentage change from 800000 to 450000, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 450000 - 800000

Difference = -350000

Step 2: Next, we need to find the absolute value of the difference. This is because percentage change is always calculated as a positive value.

Absolute Difference = |Difference|

Absolute Difference = |-350000|

Absolute Difference = 350000

Step 3: Now, we can calculate the percentage change using the formula:

Percentage Change = (Absolute Difference / Initial Value) x 100

Percentage Change = (350000 / 800000) x 100

Percentage Change = 43.75%

Therefore, the percentage change from 800000 to 450000 is -43.75%. This means that there was a decrease of 43.75% from 800000 to 450000.