I wanted to make a product for students to compare number forms that included standard form, word form, expanded form, AND base ten form that called for students to regroup hundreds, tens, and ones to form a large number. I had not seen anything like this, yet this form is on the NC EOG for 4th grade and often confuses students.
These cards can be used for any kind of center game, including "War", "Go-Fish", "Memory", etc. You could also use them in the classroom in a whole group setting for students to find others with the same number in a different form.
I would ask my students to have a whiteboard or place value chart beside them while playing this game to do "scratch work" needed to convert all forms to standard form.
Enjoy- I hope this helps you in your classroom!