The calculation can be done with the problem in view. The calculator can dictate the answer. He or she can also write it down in any order (from left to right, from right to left or even in any other order) or type it on a computer keyboard. It is not allowed to write down any intermediate results.
It is important to restrict the number of attempts for a record. The reason is that it should be forbidden to make a lot of attempts with newly generated random numbers and to wait for good luck with an easy task. For this reason the number of record attempts is restricted to 10 within a period of 24 hours. The calculator should clearly say when he or she stops practising before an attempt and starts with official record attempts.
Note: This rule also applies for all memory attempts, especially for the ones with a very short time for memorising like "most digits in 4 seconds" etc.
begins when the task becomes visible to the competitor and ends at
end of writing/dictating the answer. Two stop watches should be
At the end of the attempt the
time should be taken as an average of the two watches.
Alternatively, the use of a computer program that shows the tasks on the screen, lets the calculator type in the answer, compares the result with the correct one and measures the time from showing the tasks on the screen until getting the last keystroke from the answer is also permitted. In this case, no additional stop watches are required, but of course the attempt must still be witnessed by at least two persons.
Correcting the answer while typing is allowed, however once the computer states that a result is wrong, no more corrections are allowed.
The numbers used for the calculation should be randomly selected by computer immediately prior to the calculation and should be displayed to the calculator on a computer screen, board, screen or similar. It must be impossible to predict the generated numbers or their attributes
The computer program for selecting numbers should be
by the organiser of the contest, not by the calculator. If
program is used for presenting the numbers on the screen and maybe
for getting the result, the calculator should get the program for
some weeks before the attempt.
The program must run on a computer provided by the organiser of the contest, not on the calculator's own computer.
In some cases, the calculator may use his or her own program. In
this case, the procedure is as follows:
Attempts where the record breaker used his or her own computer or
where the organizer got the executable program directly from
breaker are invalid!
It is NOT allowed to select the task by asking the audience for "random" numbers. Other methods for selecting numbers (like using mechanical devices such as a "wheel of fortune" etc.) may be allowed as long as every possible task has the same chance.
Approved progams that can be used can be found here:
MEMORIAD software (categories: Calendar 1600-2100, Multiplication of 8-digit numbers, Addition, Square Roots),
K-Train for Calendar Calculation,
Division of a 10-Digit Number by a 5-Digit Number