I would change the mat, but love the idea. Free Printable Money BINGO Game - What a fun way to teach coins!
Counting Money Activity - lots of ways to change it up to make more challenging (how many ways can you find to make amount, use a muffin tin with various amounts, etc.) making change and counting money
Such a hard concept to cover! What an awesome resource - Over 40 pages of activities for Australian notes and coins! All you will need to teach money for the year!