Fill in the blanks.
• The difference between the smallest 4 digit number and the greatest 3 digit number is __P__.
• The place value of 3 in six thousand four hundred thirty five is __Q__.
• 2000 + 400 + 6 is same as __R__.
• __S__ should be added to 809 to make it the greatest three digit number.
The options mentioned for the question are incorrect