When first starting out, to make things simpler at the tables so that I can also take other things into consideration in the alloted time, should I first start out memorizing my hand odds exactly, or just round them for ease. And if I should round them, should I use the conventional technique of rounding anything that's X.5 or greater up, or else round the number down (to get the final ""X:1"" format)? Or, should I use another number for the rounding of hand odds (X.1, X.2, X.3, X.4, X.5, X.6, X.7, X.8, or X.9)?
My main concern is that I would like to know if rounding is that detrimental to a player that's just starting out... but, I also do not want to make too huge of a mistake of calling too much or folding too much each time. I imagine that memorizing the exact hand odds is the best way, but what is the conventional way to do it? I guess I'flopturnriver.com. When I get the chart sorted out, I will probably either use it as PC wallpaper or print it out and have it somewhere handy for online play; & then eventually, after I play enough hands again I will the specific hand odds column. But for now, I was just going to use approximations if doing that is not too harmful, that way I can make decisions quicker on the fly.

... Three specific scenarios that concern me are when I have either 4 (10.75:1 hand odds), 9 (4.22:1 hand odds), or 13 (2.62:1 hand odds) call it an even 4:1, instead of 5:1)?

HTML Code:

	    River
Outs	%	Odds	~Odds	%	Odds	~Odds	%	Odds	~Odds
20	42.60%	1.35:1	2:1	43.50%	1.30:1	2:1	67.50%	0.48:1	1:1
19	40.40%	1.47:1	2:1	41.30%	1.42:1	2:1	65.00%	0.54:1	1:1
18	38.30%	1.61:1	2:1	39.10%	1.56:1	2:1	62.40%	0.60:1	1:1
17	36.20%	1.77:1	2:1	37.00%	1.71:1	2:1	59.80%	0.67:1	1:1
16	34.00%	1.94:1	2:1	34.80%	1.88:1	2:1	57.00%	0.75:1	1:1
15	31.90%	2.13:1	3:1	32.60%	2.07:1	3:1	54.10%	0.85:1	1:1
14	29.80%	2.36:1	3:1	30.40%	2.29:1	3:1	51.20%	0.95:1	1:1
13	27.70%	2.62:1	3:1	28.30%	2.54:1	3:1	48.10%	1.08:1	2:1
12	25.50%	2.92:1	3:1	26.10%	2.83:1	3:1	45.00%	1.22:1	2:1
11	23.40%	3.27:1	4:1	23.90%	3.18:1	4:1	41.70%	1.40:1	2:1
10	21.30%	3.70:1	4:1	21.70%	3.60:1	4:1	38.40%	1.60:1	2:1
9	19.10%	4.22:1	5:1	19.60%	4.11:1	5:1	35.00%	1.86:1	2:1
8	17.00%	4.88:1	5:1	17.40%	4.75:1	5:1	31.50%	2.17:1	3:1
7	14.90%	5.71:1	6:1	15.20%	5.57:1	6:1	27.80%	2.60:1	3:1
6	12.80%	6.83:1	7:1	13.00%	6.67:1	7:1	24.10%	3.15:1	4:1
5	10.60%	8.40:1	9:1	10.90%	8.20:1	9:1	20.30%	3.93:1	4:1
4	8.50%	10.75:1	11:1	8.70%	10.50:1	11:1	16.50%	5.06:1	6:1
3	6.40%	14.67:1	15:1	6.50%	14.33:1	15:1	12.50%	7.00:1	7:1
2	4.30%	22.50:1	23:1	4.30%	22.00:1	22:1	8.40%	10.90:1	11:1
1	2.10%	46.00:1	46:1	2.20%	45.00:1	45:1	4.30%	22.26:1	23:1

Just divide your flop, there's five cards you know, so the other 47 will be divided by how many are good for you, and that's your probability of hitting.

You have a nut call vs an all in.

If you're not facing an all in, then flop bet and we have two more rounds of betting.

implied odds is arguably more important.