Students and number sense is something that I'm always trying to improve on. This seems like a topic that is a struggle for a lot of students. With the new CCSS students will need to have a deep understanding of number sense. So I have some fun activities that I like to use to help teach Number Sense.
Math Rocks Ones, Tens, Hundreds
Place Value Game from Teacher Tipster
Place Value Song from Teacher Tipster
Computer Games for students:
If you like these ideas I have a new unit Having Fun With Number Sense Fun. It has games/activities that students love. Besides playing music in the classroom I like to play learning games in just about every subject.
This is a two player game that students can play. Students roll place value dice and they need to place the numbers so it reads from least to greatest.
Another activity in that unit Guess My Number.
If you are interested check out my TPT and TN links at the left.