Odds can be displayed in two ways: Fractions or Decimals

You will probably be most familar with odds as fractions (e.g. 3/1). But, you can opt to show them as decimals (e.g. 4.00) should you wish.
How to Change Odds Format
Below is a table highlighting the gap between the two: Fractions
Decimals
What does it imply?
3/1 4.00
Place #/$1 euro to return #/$4 (#/$3 euro winnings + #/$1 bet )
4/1 5.00
Set #/$1 euro to return #/$5 (#/$4 euro winnings + #/$1 stake)
11/2 6.50
Place #/$ two euro to return #/$13 (#/$11 euro winnings + #/$ two stake)
Fractions
Whenever you see two numbers separated with a slash, i.e. 10/1, this really is a fractional gambling odd.
Fractional odds permit you to calculate how much you are going to win on your bet in comparison to you stake. The number on the left(e.g. 10) is how much you will win. The number on the right is you need to bet.
9/1 for every #/$1 you bet, you will win #/$9. Additionally, this can be calculated as 1 / (9 + 1) = 0.10 – There’s a 10% chance that the event will happen.
1/1 for every #/$1 you bet, you’ll win #/$1. Additionally, this can be calculated as 1 / (1 + 1) = 0.50 – There is a 50% likelihood that the event will take place.
1/4 for every #/$4 you wager, you will win # 1 /$1. In addition, this can be computed as 4 / (4 + 1) = 0.80 – There’s a 80% chance that the event will take place.
Decimals
At any time you see chances displayed in numeric form i.e. 9.00, this really is a decimal betting odd.
Decimal odds allow you to calculate just how much you will be returned if your bet win. Simply multiply your stake by the decimal amount displayed and that is how much you’ll receive – including your bet. The decimal odds are exhibited up to 2 decimal places, but the return will be paid out by calculating at the real odds, to the nearest #/$ 0.01. By way of example, if your wager is put at odds of 4.3333333 (that can be 10/3 in fractional), a #/$10 bet would return #/$43.33 in case it wins, but your chances would show as 4.33.
9.00 for every #/$1 you bet, you’ll win #/$8. You’ll also receive your # 1 /$1 bet back so your whole return is #/$9.
2.00 for each #/$1 you bet, you’ll win #/$1. You’ll also receive your #/$1 stake back so your whole return is #/$2.
1.25 for each #/$4 you wager, you’ll win # 1 /$1. You’ll also receive your #/$4 stake back so your whole return is # 5 /$5.

Read more: https://www.woodexperience.be/2019/10/26/advertise-ready-to-return-to-action-at-ascot/