To find the percentage change from 1000 to 350, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 350 - 1000

Difference = -650

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 = |-650|

Absolute Difference = 650

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

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

Percentage Change = (650 / 1000) x 100

Percentage Change = 65%

Therefore, the percentage change from 1000 to 350 is -65%. This means that there was a decrease of 65% from 1000 to 350.