This game makes players think about place value and probability as they race to complete their number train.
“Two-Digit Number Train” is an excerpt from Math You Can Play Combo: Number Games for Young Learners, available as an ebook at my bookstore (Thank you for cutting out the middleman!) and in ebook or paperback through many online retailers. Read more about my playful math books here.
The Math Game Monday posts will be available for one week only. If you missed this one, explore the Topic Tag links in the sidebar. There are more than forty free games scattered around the blog. Have fun playing math with your kids!
Denise Gaskins' Let's Play Math 
Joe Schwartz and I have thought about this game and variations a lot. (Decimal Pickle, for example!) His idea for this that I love is to have players make a numberline afterward with their numbers. Really works on relative magnitude.
That’s a great idea! I’ll add it to my file of notes for the second edition…