If you look at your game card (if it's like the one I use) you will see numbers in 7 Rows. 1 through 9 on the 1st Row. Numbers 10 thru 18 on the 2nd Row. Numbers 19-27 on the 3rd Row, etc.
When I talk about "rows" this is what Im talking about. Since you have 5 numbers to pick and there are a total of 7 Rows.....what does that tell you? Tells me that at least two of the rows on that game card are not going to have numbers that will be used. Figure out what Rows aren't going to have a number, eliminate those numbers. This is why numbers 19-27 was not in my first post. I had been able to eliminate them from play. I number the rows 1-2-3-4-5-6-7 and track the Rows by the number assigned to the row. When I can rule out a certain # I eliminate all numbers on that Row.
As far as Denominations....just simple math. You have numbers that are considered "Singles" (1-2-3-4-5-6-7-8-9-10). You have numbers that are considered Teens (11-12-13-14-15-16-17-18-19). You have Numbers in the 20's, 30's, 40's and 50's.
This is a total of 6 different Denominations yet you still have only 5 Numbers to pick. You can't have a number play from each of the 6 Denominations if you only pick 5 numbers.
The "spread" is the number of Odd Numbers and Even Numbers used. With 5 numbers you can't have the same number of Odd as you do Even in a game or visa versa. They are going to split 2/3, 3/2, 1/4, 4/1 of All Odd or All Even.
In order to track this way you have to be aware of what has been happening in order to realize what usually plays so you will be able to anticipate what is going to happen next. Most people don't realize that most of the time numbers on only 4 rows usually show up. Knock out 3 Rows and you knock out 27 of 59 numbers. Most of the time only 4 Denominations appear. Knock out even more numbers.