Been writting a lot of content about horse races of the past, at present focusing on the Grand National.
A lot of the old races are recorded to a 100 (such as the 1860 Grand National SP of 100/7).
The simple way to work out the actual odds is to get a calculator out.
Now, here is the fun bit. Race track bookies still accept this old-fractions. If you get a calculator you will see that there are slightly enchanced odds. For example £100-16 is the fraction for 6/1, but for your £16 bet you get 6.25/1. Of course you don’t have to bet to win £100, £1000, or £10,000 – a bet of £300-48 is equally acceptable. Getting these enchanced odds will over the course of a season make a real difference to whether you finish in the black or red.
Modern race track receipt systems are integrated to accept old fractions and the receipt will show this, so don’t be shy to ask. When I used to bet at Wimbledon Dogs, if you requested a fraction from bookmaker Dell Nash he would always say “sign of a miss-spent youth” .

Typical examples:
100/3 – 33/1
100/6 – 16/1
100/7 – 14/1
100/8- 12/1
100/9 – 11/1
100/11 – 9/1
100/12 – 8/1
100/14 – 7/1
100/16 – 6/1
Happy Punting.

Bet365
Betclic
BetVictor
Bwin
Ladbrokes
Paddy Power
Pinnacle
SkyBet
Sportingbet
Stan James
Unibet
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