Here is an effective and fun way to help your students develop better number sense. It involves using a space themed hundreds chart and move cards. Students place "flying saucers" on random places on the hundreds chart. We used cheerios and munch as we play, but you could just use circle markers as well. Students are dealt "move cards" that allow them to move a certain number on the hundreds chart. Some moves involve tens numbers and others just ones. Students move to capture the flying saucers found on the board. The first one to capture five is the winner! This is a great addition to your math center line up!