Learn how to minimize the sum of squared error for regression line problems in stats. Whether you need help studying for that next big stats text or just a hand finishing your homework, you're sure to be well served by this four-part free video math lesson from Salman Khan. Pa ...more
Pythagoras was a smart man, so smart that his mathematical theory is named after him and still used today, more than 2,000 years later: the Pythagorean theorem. It implies that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two ...more
YAYMATH. This video is a demonstration of usage of the distance formula to find the distance between two given (x,y) points. In this video, the tutor guy who is teaching the distance formula to his students takes an example of two (x,y) points such as (5,-1) and (11,7). He the ...more
Imagine two stakes in your backyard. Now draw an east-west, north-south coordinate system on your lawn. Measure the east-west distance between the stakes and also the north-south distance. Take the square root of the sum of the squares of the two measurements and, voilà, you e ...more
This video shows the method to write a logarithm as a sum or difference of logarithms. The square root of the term given is taken out as half according to the rule. Then the numerator and denominator is divided into product of factors. This is broken into the difference of num ...more
The Pythagorean theorem is a simple theorem that states that - for a right angled triangle the square of the length of the hypotenuse is equal to the sum of the squares of the length of the remaining two sides. In this video, a right angled triangle with three sides, namely a ...more
In this video the instructor talks about Pythagorean theorem and how to apply it to right triangles. Pythagorean theorem states that in any right triangle if a and b are the lengths of the legs and c is the length of the hypotenuse the sum of the squares of the lengths of the ...more
It's Monday, which means once again, it's time to highlight some of the recent community submissions posted to the Math Craft corkboard. In this post, we'll also make a flexagon, which is a type of transformable object. Rachel Mansur of Giveaway Tuesdays posted several pictur ...more
This video shows the method to find the variance and standard deviation using Excel. The variance shows the variability of the data points from the median. We find the difference of the median and the mean. We write the formula using '=' sign. The median and data points are pu ...more
Radicals are square roots which are not integers; the square roots of 2 or 3 are examples of radicals. The presenters show simple ways of how to add and subtract such radicals. They explain that by using the method of factoring, the addition or subtraction is made very easy. I ...more
In this video the instructor shows how to factor a general quadratic polynomial. Here the first step is to identify the coefficient of the squared term. Write the reciprocal of the numerical coefficient of the squared term out side and write two separate parenthesis which are ...more
In this video the instructor shows how to factor the difference of squares using a formula. The formula to find the difference of squares can only be applied if you have two perfect squares. The formula is (a * a - b * b) = (a - b) * (a + b). That is the difference of squares ...more
I got hooked on origami sometime after Math Craft admin Cory Poole posted instructions for creating modular origami, but I had to take a break to finish a quilt I've been working on for a while now. It's my first quilt, and very simple in its construction (straight up squares, ...more
It doesn’t matter how long ago your last geometry class was, you can still impress your friends by finding a geometric mean. The geometric mean can be used to find the average of numbers with out unusually high or low results effecting the result. The geometric mean of two nu ...more
The first video explains the Method of Mathematical Induction. It also gives a background of Francesco Maurolico, Pascal and John Wallis. You'll see how to apply the Method of Induction to prove the sum of odd numbers is a square. Next, you'll prove Inequality using the Metho ...more
Exponent of a number is nothing but the number multiplied to it self the exponent number of times. So five squared it equal to five multiplied to it self. Now when an exponential number is divided with another such number the result is the number raised to the different of the ...more
In this math tutorial the instructor discusses the properties of a rhombus. He begins by saying that the properties of a rhombus are similar to the properties of a square. He says that the rhombus is a quadrilateral and hence the sum of internal angles of it is 360 degrees. He ...more
In this tutorial the instructor shows how to compute the area of irregular shapes. He demonstrates this with an example showing an irregular area and says that as there is no direct formula to calculate it, you need to break up the irregular area into identifiable simple geome ...more
Need to figure out the area of a trapezoid for a household project? Even if you just want to sound smart, there is a simple formula that can be used every time you need to find the area of a trapezoid. Try the formula and see how good you are at geometry. A trapezoid is a fou ...more
The app that started as simply a photo-sharing social media platform has expanded to encompass so much more than that. Between live videos, stories, chat, and animated stickers, Instagram is more than the sum of its pictures. Now, there's a new feature to add to that list for ...more
Just like some of its popular puzzle predecessors, 2048 is an extremely simple yet insanely addicting game that pits you against a slew of blocks, to be configured into increasing sums with fervid, high-paced moves. If you have yet to play it, check out either the iOS (by Ketc ...more
Dumplings have been around for centuries in various forms; spätzle, as well as chicken and dumplings, are dough-y dumplings with no filling, whereas Russian pierogis and Chinese jiaozi are dumplings that contain meat, vegetables, or both. Asian dumplings, also called pot stic ...more
Aesthetic Houses: What are they? If you've played Minecraft for some time now, you most surely know how hard it is to build a great looking house to live in, that meets both your vision of your dream house and expectations for functionality. This brings us to the definition: ...more
The end game is a very important aspect of playing Scrabble. If you have just a few letters left on your rack and there are none left in the draw bag, but you're currently losing the game, you still might have a chance to win if you play your cards (er… tiles) right. No matter ...more
Thanks to the PlayStation 3 and Xbox 360, video games are constantly evolving to higher degrees of sophistication, with complex graphics, lifelike resemblances and storylines that create exciting experiences that relieve the tediousness of our everyday lives. It's a little di ...more
If you're always taking blurry and underexposed pics with your mobile device, try using some of the tips below to turn your phone into a valuable photography asset. It doesn't matter if you have an iPhone, Android smartphone, or even a first-gen camera phone... you can still t ...more
More information is available to us now than ever before. We simply cannot make sense of so much data on our own. Thankfully, we have programs to do the heavy lifting for us. Apache Spark and Python are two important resources for making sense of Big Data. Spark's open-source ...more
The smartphone market is stagnating. Without hordes of new users rolling in every year, the best way to boost profits nowadays is to poach customers from the competition. That's exactly what Apple appears to be doing with iOS 14. As a longtime Android user, I'm genuinely intr ...more
Phone specs get better and better each year, and multiplayer mobile games are right there with them. Instead of playing solo, jump into some real-time gameplay with co-op and player vs. player modes, and battle friends, family, and strangers from around the world. But which mu ...more
If we were to assign a theme for the 2019 edition of the Next Reality 30 (NR30), it might be something along the lines of, "What have you done for me lately?" Many of the top names in the industry from the 2018 edition remain the same, but their positions have shuffled. The p ...more