To find the percentage change from 1000 to 10000, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 10000 - 1000

Difference = 9000

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 = |9000|

Absolute Difference = 9000

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

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

Percentage Change = (9000 / 1000) x 100

Percentage Change = 900%

Therefore, the percentage change from 1000 to 10000 is 900%. This means that there was an increase of 900% from 1000 to 10000.