Well, I'm a day late to Joanne's party, but I know she'll forgive me. :o)
a free game that has been in my TPT store for a long time, but oldies are definitely goodies if you ask me! Kids LOVE math games!
Make One Whole is a great game to help them understand that decimals are less than one whole, and that hundredths are smaller than tenths. I have my students use base ten blocks to represent their tenths and hundredths as well, so they can see the model as well as the number form.
Go grab this game if you teach decimals- your kids will love it! And of course, I would love some feedback if you do use it! :o) Make sure to check out the other link-ups over on Joanne's blog, too!