Building number memory retention. (exercises)

To become a good sudoku number player you must be able to "hold" a number(s) in your mind.

Beginners1 Memory Number Retention Exercise

1
7
2
5
8
3
6
9
2
5
7
4
9
1
6
8
             

Above are two 1 to 9 number grids. Each grid is missing one number - determine the missing numbers - making a mental note of them. Now proceed to the two below grids. Determine the missing numbers in each - making a mental note of them, also.

9
8
4
1
5
2
3
6
4
8
7
9
6
3
1
2
             

Now recite all the above grid numbers. Repeat process until you can. (mentally repeating number)

Ok, once able to do the above - proceed and determine the missing numbers in the two below grids.

9
5
4
7
1
6
2
3
2
7
6
5
8
3
1
4

Ok, now recite all the above determined grid numbers. Repeat this entire process on this page until you can.

             

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Medium Strategy to try: Add up the first numbers in each row within each grid. Be sure to determine the missing number(s). Do this with all three grid sets. Recite the added up numbers.
For example:
Grid one and two: 11 and 14
Grid three and four: 21 and 17
Grid five and six: 18 and 15