The derivative has probably unlimited applications in physics, biology, economics and generally in real life. But let's see how we can use it to solve simple problems like optimizing the usage of a metal sheet when we want to build…

## Equation of the tangent to the curve at a point

Calculus is one of those branches of math that I must say I love it. It help us to find solutions to problems where the other branches fail. The following is just an example where calculus allows us to find…

## Math can be sweet

I come to you with a simple problem which hopefully any of you can solve it. Although the final solution is what certifies that the problem has been solved correctly I am more interested to see the approach that each…

## Multimea numerelor naturale

Metode de rezolvare a problemelor de aritmetica Metoda figurativa : este o metoda de rezolvare a problemelor de aritmetica ce consta in reprezentarea printr-un desen a marimilor necunoscutea si fixarea in acest desen a relatiilor dintre elea si marimile date…

## Calculul aproximativ al radacinii patrate

Aceasta metoda descrie calculul aproximativ a radacinii patrate. Dorim sa aproximam valoarea . Lasand la o parte toate celelalte metode cunoscute de extragere a radacinii patrate dintr-un numar, voi incerca sa va prezint o metoda simpla si eficienta. Metoda se…

## Faster Way to Multiply any Number with Numbers from 11-20

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…

## Find the square of a number (nearing to 100) in head

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…

## Fast multiplication n-digits (on certain situations)

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…

## Fast multiplication by 11

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…

## Fast multiplication 3 digits

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…