3X3 multiplication in 3.2 sec
9 Likes
Nice!
Can I ask, since I’m not familiar with the Memoriad software (they don’t have a Mac version)… do you have any control over the numbers that get selected?
There are four instances with a zero, such as 302, 203, 902, and 202. Is that by design? I mean for the last question (334x202) that basically just means: double the number and add the same number with a shifted decimal point. Even the 189 to the left of it is just 100-10-1 so all you gotta do is add two zero and then shift and subtract twice the number that is already there.
I still think you got a nice score… but somehow it seems the problems are deliberately chosen by the software so that shortcuts can be applied. Maybe I’m just seeing patterns where there aren’t any. Anyways, I’m not questioning your skills at all… just curious about the software.
3 Likes
Bjeorn, I guess you’re just better than most mental calculators at finding these patterns! At the speed that flou is working (3 operations per second) it’s fastest to brute-force the numbers with cross-multiplication rather than to scan for patterns.
This is one reason I like verbal mental math—doing e.g. 3×3 multiplications without seeing the numbers means that shortcuts like you describe really do help. However for speed multiplication above 2×2 I almost always use the rather bland cross-multiplication.
The world record is around 4 operations per second for multiplication (Marc Jornet Sanz, 10 questions of 8Ă—8 in 163 seconds) so @anon93030886 , this time is very impressive! Note however, that with larger multiplications the operations get harder (basically recalling a 1Ă—1 multiplication from memory and adding in onto a (larger) running total).
6 Likes
Sorry about that. It isn’t easy to rearrange the order of the posts above, but I’ve fixed things so that it shouldn’t happen again.
2 Likes
@anon93030886 , I agree with all of your suggestions—especially the first one about using a keyboard shortcut to stop the timer—but I’m not in any way involved with the development of this software, so there’s nothing I can do to help.
You might pass on your ideas to Melik Duyar and his team, who manage the Memoriad software.
Since I do actually develop my own training tools, there’s a small chance I have something different to help you. What category(ies) are you training?
1 Like
You can use this training tool if you like: Exact Divisions. I made it as while setting up some other things, including the Spring Challenge on World Mental Calculation, which is Decimal Division.
I can add more digits to the Exact Divisions tool if anyone needs.
2 Likes
I like the software, do have something similar for other events too?