Read More  www.beeman.us  Important Notice 
NOTE that since division by zero is undefined, for problems that involve this, the correct answer is an upper or lower case u (for undefined) or a period (".").
This page works well with "FireFox" and "Safari" browsers. It coexists with "Internet Explorer".

Use the calculator below to check whether a given report is valid. Type or paste all 32 characters of the report into the field on the left, then press the "Validate" button. The result will appear.
Example Reports:
RHB1A10817172601230020092
RHB1S10817172301310081461
RHB1M10817172901350092330
RHB1D10817173101300081628
RHB1A70817173307230124548
RHB5A10817174101230052699
RHB5S10817174301340159999
Choose a function to practice (Addition, Subtraction, Multiplication, or Division). When you click the "Start Exercise" button the timer starts. Enter the correct answer using the number keys followed by the "Return" or "Enter" key. If you make a mistake, the error counter will increment and an entry will be made in the error log. No need to use the backspace key. Just type a new answer. You will be stuck there until you get the right answer.
Since division by zero is undefined, for division problems where the divisor is zero, enter "U", "u" or "." (period), whithout the quotes, of course.
The program keeps track of how many problems you have done, how many are left, and the number of errors. Errors are entered in the "Error Log" so that you can review your mistakes.
When you have done all the problems on a given level, a report will appear consisting of 32 characters. The significance of the characters in the report is as follows:
RHB1A10817172601230020092 RHB : My initials. You should use yours. 1 : Period 1 of the school day. A1 : Addition, level 1. (M = Multiplication, S = Subtraction, D = Division). 0817 : I started doing this set on August 17. 1726 : At 1726 hours (5:26 PM). 0123 : It took me 1 minute and 23 seconds to finish. 00 : I did not make any errors. (00 = zero errors 01 = 1 error etc.). 20092 : A cryptographic check sum of the report. It discourages people from making up a fake "Report". If they do, there is one chance in 100,000 that it will verify correctly.
Seven "levels" of practice are provided. The reason for these is that it is tough to try to learn all 169 combinations of problems for 0..12 all at once. These levels allow you to break the learning down into manageable chunks.
Below is a graphical summary of how the "Levels" work. All evennumbered levels cover only the permutations that were not covered in the nextlower level. Oddnumbered levels cover all possible permutations of numbers up to the limit.
0  1  2  3  4  5  6  7  8  9  10  11  12  
0  L1 36 new 36 total  
1  
2  
3  
4  
5  
6  L2 = 45 new L3 = 81 total  
7  
8  
9  L4 = 40 new L5 = 121 total  
10  
11  L6 = 48 new L7 = 169 total  
12 
My only reward for writing this is the 15 milliseconds of fame I receive from having my name here. Don't deprive me of that.
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