Battleship Number Line is a wonderful game for students to practice seeing where a number belongs on a number line. There are four different types of numbers to practice; fractions, decimals, whole numbers and measurements. This game has been very effective in helping my students think about decimals and fractions as an actual amount, not just digits.
Here are some screen shots:
I highly recommend using Battleship Number Line with any students who are learning about fractions, decimals or whole numbers.