Most important numbers to know by heart?

[ArkhamAndy]

What do you think are the most important numbers to memorize to master NL hold'em?

For instance memorizing the tables for the odds of hitting a card on the river/turn/combined seems to be useful if not necessary. Please include an URL to reputable numbers if you can, preferably sorted/grouped/categorized so that they are easy to memorize.

So what are the most important numbers to learn according to you?

/Andy

[Gonso]

A bunch, and this is not a complete list at all. You'll have to do some of the legwork but this should point you in the right direction...

Understanding how to do an EV calculation.

Hand matchups. Pair vs lower pair, one overcard vs. pair, two overs vs two unders, etc. Go download Pokerstove if you don't have it.

What hand ranges look like. Again pokerstove can help. If I say a guy is raising 15% of his hands, it helps to know what those hands generally are.

Know your outs and the "two percent rule", at least the basics. Know how many outs to complete an open ended straight draw, flushes, gutshot draws, combination draws.

Know that the odds of flopping a set with a pair is 7.5 to 1.

Raise and bet sizing. Know what a standard raise is, and how much to reraise.

There are threads on these to look up, it you can't google them. Also a few books like No Limit Hold 'Em: Theory and Practice will fill in some gaps.

Then, there's fun things to know like what percent of the time overcards with flop when you hold 99.

[insyder19]

I always thought and read somewhere that to flop a set the odds are 1 to 9.5

[Gonso]

No, it's 7.5 to 1, which is the same as saying it happens once every 8.5 times.

[Bantam222]

100-(48/50)(47/49)(46/48) = 11.755% flop set = 1/8.5