To find the percentage change from 10000000 to 1000, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 1000 - 10000000

Difference = -9999000

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 = |-9999000|

Absolute Difference = 9999000

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

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

Percentage Change = (9999000 / 10000000) x 100

Percentage Change = 99.99%

Therefore, the percentage change from 10000000 to 1000 is -99.99%. This means that there was a decrease of 99.99% from 10000000 to 1000.