Rounding

This week I am focusing on ROUNDING.
The TEK says:
3.2C represent a number on a number line as being between two consecutive multiples of 10; 100; 1,000; or 10,000 and use words to describe relative size of numbers in order to round whole numbers;

I start with asking my kids to make number lines...
I want them to be able to represent a number on a number line as being between two benchmark numbers (10, 100, 1,000 or 10,000) so they can use an open number line to compare and order numbers.

Here are some rounding games:
http://www.abcya.com/rounding_numbers.htm
http://www.math-play.com/rounding-numbers-pirate/rounding-numbers-pirate.html