Yes, you can place abet on every single number on the wheel. However, it will cost you more than you will win. There are 36 or 37 (American Roulette) numbers on the wheel. If you place a AU$1 bet on each number, it will cost you AU$36 or AU$37. However, the payout for winning a straight bet is 35:1, so you will only win AU$35.