The highest number on a roulette wheel is 36, according to Online Casinos. The American roulette wheel has a total of 38 crevices, including zero and double zero. The European roulette wheel has 37 slots, and it doesn't include a double-zero crevice.
When playing roulette, the wheel is spun in one direction while a ball is rolled in the opposite direction. Bets are paid out according to where the ball lands. The roulette wheel is divided up into alternating black and red wedges with numbers on every wedge in no particular order.
Online Casinos explains inside bets are placed on individual numbers or combinations of individual numbers, while outside bets are generally broader and include bets for groups of numbers.