To find the percentage change from 1000 to 1000000, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 1000000 - 1000

Difference = 999000

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 = |999000|

Absolute Difference = 999000

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

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

Percentage Change = (999000 / 1000) x 100

Percentage Change = 99900%

Therefore, the percentage change from 1000 to 1000000 is 99900%. This means that there was an increase of 99900% from 1000 to 1000000.