Creating a Probablity Game

We were looking for a cross-curricular way to address probability content in Grade 4 Mathematics and content from Applied Design 4, which is new to the curriculum. We came up with the idea of making a game of chance, because we felt that the process of creating a game would reinforce new concepts in math and applied design by giving students an opportunity to apply these concepts in practice.  
Subject: 
Mathematics
Grade Level(s): 
Grade 4
Cross-Curricular: 
English Language Arts
Applied Design, Skills, and Technologies