Decimal Odds: are simply inverted probabilities, which is why it is so easy to calculate with them. Instead of saying an outcome has a probability of X%, X is now translated into a number. 100% divided by Chance = (100% / Chance) = The Odds.
Using Odds Compiler Platform makes understandin the way that the bookies calculate and offer the prices for every betting market of the game really easy. Besides match odds (1-2-X) the prices of all the other betting markets are based on statistics.