## Outs & Hand Odds Memorization Questions

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'm looking for a way too fudge things that's a little more precise than the rule of 2 & 4 (although I would still use the rule of 4 for allins on the flop, since there's still two cards to come & I'm guaranteed to see no more betting). I think the answer is somewhere online because I looked it up about 5 or 6 years ago, but I cannot seem to track it down by doing a Google search or searching twoplustwo.com or 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 remember 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) outs. Could I just consider those three situations as having: 11:1, 5:1, and 3:1 hand odds? Or, should I maybe round the hand odds for the 9 out hand down (and call it an even 4:1, instead of 5:1)?

HTML Code:
```	    Flop to Turn	    Turn to River	    Flop to 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```