Is there a faster way to multiply by 11? What about 14? Let's take the following example: 1412 x 14 = 19768 The technique helps you finding digits from left to right as following: take the first digits of 1412…

Is there a faster way to multiply by 11? What about 14? Let's take the following example: 1412 x 14 = 19768 The technique helps you finding digits from left to right as following: take the first digits of 1412…

How much is 5 Â² ? How about 12 Â² ? Well, if you have already finished the gymnasium then maybe you are already used to find the square for these numbers. But how about 104 Â² ? I found…

I've found a solution for fast multiplication n digits with respect to the following conditions: have the same number of digits the first digit of both numbers are equal the sum of last digit of both numbers is 10 Example…

One of my favourite techniques is that which allows us to fast multiplication by 11. To get your attention I will say that I can multiply in my head the following numbers: 748346274 x 11 = 8231809014 The technique is…

Are you scared when comes to multiply a product like 123 x 321 in your head? Well, that's not so hard as it seems to be! Fast multiplication 3 digit For this we can use a technique which reduce the…

How do you calculate how much is 93 x 97 in your head? Sounds that impossible? There are many quick algorithms depending on the nature of the numbers you want to multiply. In some situations fits better one algorithm, in…

I don't want to install and use the Xfce calendar plugin, because 99% of time I don't need it (so why should I keep the laptop memory busy all the time with something that I rarely use?) As alternative I…

I just started my Gentoo and then my X session. I have noticed that neither mouse or keyboard is working (even if it works ok before starting X). The answer lies in /var/log/Xorg.1.log file. Just search for these lines which…

Whenever I have suspend/resumed my Gentoo system I found my wifi network status as started but actually not working. I guess that standby/hibernate/suspend is handled by sys-power/pm-utils, which is very well described here, I can make use of it to…

Tabla de materii Relatii intre puncte, drepte si plane puncte, drepte, plane: conventii de desen si notatie determinarea dreptei; determinarea planului piramida: descriere si reprezentare; tetraedrul prisma: descriere si reprezentare; paralelipipedul dreptunghic; cubul pozitii relative a doua drepte in spatiu;…