Math Knowing Search Results

How To: Multiply and divide fractions in math

One can learn, from watching this video, how to multiply and divide fractions. Prof. Alexander gives a discourse on multiplication and division of fractions in a simple, easy way. For multiplication, one should first look for highest common factor in the numerator of one fraction and the denominator of the other, and vice versa, and if found, carry out the reduction by that factor. Then the numerator of one fraction is multiplied by that of the other fraction, the same operation is carried ou...

How To: Multiply rational expressions in two "easy" steps

In this Math Made Easy tutorial the instructor shows how to multiply rational equations. He states that multiplying rational equations is simply a process of simplifying equations, in which he says that first the polynomial equations should be factorized. He further shows how to factorize the equations by solving an example. After factorizing them he reduces the common terms on the numerator and the denominator and finally arrives at the new simplified equation. This video clearly shows the m...

How To: Subtract fractions with uncommon demoninators

In this tutorial the author shows an easy and simple way of subtracting fractions with uncommon denominators. He says that to subtract fraction with uncommon denominator, we need to make their denominators equivalent first and after making the denominators equal, you need to increase the numerators proportionally to maintain the original ratio of the fraction. Now as the denominators are same, we can directly subtract the numerators arriving at a new fraction. He further shows how to deduce t...

How To: Multiply mixed numbers

A guy from the website Math Problem Generator explains, in this video, how to easily multiply mixed fraction numbers. First, he demonstrates that you need to convert both of the numbers to improper fractions. Then he shows that you need to multiply the two resulting numbers together. The resulting fraction is also improper, so it needs to be converted back to a mixed number fraction. In the example that he provides, he shows that one and a half multiplied by one and a third becomes two and a ...

How To: Find the area of a ring w/ the areas of 2 circles

Doina Popovici's video explains how to calculate the area of a ring. She takes us really slow, down to all the steps of this process. It's very important that she explains every math formula and operation so you cannot get lost into this solving. The video uses nice pictures and colors in order to make learning easier and nicer for those who are interested. At the end of the video you'll surely be able to solve by yourself a problem like that and your appetite for geometry will grow significa...

How To: Find the area of a trapezoid quickly

In another installment of Math Problem Generator this video shows how to find the area of a trapezoid. First it displays the dimension of the triangle, with the corresponding formula to find the area. This quick and easy demonstration shows how to plug in the correct dimensions into the formula. From there you use the order of operations to solve the formula correctly. The video will teach you the basic procedures in solving for the area of a trapezoid, and will help you take on more complex ...

How To: Multiple positive & negative numbers

Multiplying positive and negative numbers may seem confusing. However, in this math tutorial, multiplying numbers with different or same signs is made easy and eliminates all confusion. The narrator of the video explains the key rules to remember when dealing with the possible combination of positive and negative numbers. The video breaks it down to two key rules. When you have a negative and a positive number; the result will always be negative. When you are given two numbers that have the s...

How To: Avoid the #DIV/0! error in fornulas in Excel

Getting errors when trying to crunch your numbers in Windows Excel can be frustrating, but with this fun and easy to follow guide to remove the "#DIV/0!" error. When the computer thinks you're trying to divide by zero, it produces an annoying error, but by following this video guide you can be free of that irritation. He goes step by step on how to edit the formula calculator so that it no longer produces the error, and even explains in detail why this is solving the error problem. You don't ...

How To: Subtract with borrowing

For people who are learning basic math skills, this video will show you how to subtract larger numbers which involve borrowing. If the top number on your rightmost digit is smaller than the number before it, you will need to borrow from the column before it. To do this, you will have to cross out the left hand number, subtracting one from its value. You can then add 10 to your original number and continue with your subtraction. If the left hand number is 0 and too small to be borrow from, you...

How To: Graph a straight line given its equation

Doug Simms who runs a page at free math tutoring shows in this video a very broken down process that can help you understand how to graph a straight line from an algebraic equation and why it is that way. On a smart projecting board, in a slide show creating software, he explains at a steady pace how to break down a line into its individual line intercepts and an extra point thrown in for verification. After that, he takes the points and puts them on a graph to show you how to. You'll just ha...

How To: Solve the mathematical Kakuro logic puzzle

The Kakuro, or Kakkuro puzzle, is a kind of logic puzzle that is often referred to as a mathematical transliteration of the crossword. Kakuro puzzles are regular features in most, if not all, math-and-logic puzzle publications in the United States. Dell Magazines came up with the original English name Cross Sums and other names such as Cross Addition have also been used, but the Japanese name Kakuro, abbreviation of Japanese kasan kurosu, seems to have gained general acceptance and the puzzle...

How To: Solve an algebraic equation

Math can be tricky, especially when you're trying to decipher algebra. It's a love-hate thing; if you don't love math, then you hate it, and there's no in-between. But it doesn't have to be a pain to solve a few problems. It's actually quite simple once you figure it out. An algebraic equation is an equation that includes one or more variables. These equations can be solved as long as the number of variables does not exceed the number of equations.

How To: Hack Google Images

To hack into Google images follow the following steps. You will first need to open a new internet browser window and go to Google, then load their images website. Next type into the search bar your image query and press search. Once you have gotten your search results paste the following code into your address bar:

How To: Use a light meter to properly light a digital film

A light meter can prove to be an invaluable tool on any film set, allowing you to quickly and efficiently set lights and know the correct exposure values of those lights. Light meters were initially designed for still photographers and cinematographers can easily calibrate them to a given film stock speed for shooting film. But what about today’s digital cinematographer? I’m glad you asked. In this video tutorial you'll see how you can use a light meter to quickly and efficiently light a scen...

How To: Graph square root functions & inequalities

On Yay Math, Robert Ahdoot, founder of Yay Math, will show you some square root functions and some inequalities. He begins with the problem y=x². Then he makes a sketch with two intersecting lines in a t shape. The problem is illustrated by a curved U shape, the U's bottom resting on the horizontal bar, which represents x, while the center takes the vertical line. The vertical bar represents y. This U is directed up because the x² is a positive number. If the number were negative, the U would...

How To: Solve word problems involving the division of whole numbers

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to unpack and solve word problems that require you to divide whole numbers.

How To: Crochet a double crochet stitch into the starting loop

Shred Betties demonstrates crocheting a double crochet stitch into the starting loop for making a beanie step by step. It's as easy as simple math! You'll need the following: crochet hook, yarn. To have 3 loops on your hook: insert hook in top loop of the chain, yarn over, insert in the big loop, yarn over and pull yarn through big loop. Pull yarn through 2 loops on your hook so there will be 2 loops left on the hook. Yarn over and pull yarn through the 2 loops remaining on the hook. This com...

How To: Tie the spiral knot

This video shows you step by step how to tie a spiral knot. In math, a spiral is a curve starting from a central point, getting further away as it revolves from the point. The ancient Chinese considered the spiral to be a symbol of the sun, the Celts and Greeks consider it a symbol of growth and evolution. Here you'll learn everything you need to do to tie this beautiful knot. It's quick and easy follow for you knot lovers.

How To: Perform the "jack's party" magic card trick

What else can you do with a deck of cards besides play games? Magic! There's nothing better for a magician's repertoire than a few great card tricks, so make sure you watch this video tutorial on how to perform the "jack's party" magic card trick. This is a lengthy trick, but it's sure to amaze and baffle anyone. To do this jack's party card trick, a little mathematics goes a long way, so don't fall asleep in math class.

How To: Check for square

Tim Carter of AsktheBuilder.com demonstrates several ways to check for square to make sure your jobs turn out right. What is square? Are they talking about a framing square? No, they are indicating the all the corners in a project are 90 degrees. There is a way to check your object for square without doing a lot of fancy math. An essential video for properly remodleing a room.

How To: Sing a song about bubbles with a preschooler

For preschoolers a rhyming song with hand movements. Singing songs with your child is wonderful for many reasons. The most important reason is that singing is it is fun and children love to sing. Songs are great for increasing vocabulary and pronunciation. Using hand and body movements with songs and rhymes helps preschoolers learn to control their bodies. There is even research that has shown that children who are actively involved in music do better in reading and math when they start schoo...

How To: The Perfect Formula for Making Any Cocktail

Like many others, I like a good cocktail every now and then, and I've always been impressed when my cocktail enthusiast friends would come up with a new drink or even just remember how to concoct a Clover Club (FYI, it's made with gin, raspberry syrup, lemon, and egg white). There's a secret bartenders and craft cocktail aficionados know, though: It's all about math, the simplest and most intoxicating math. Pythagoras would be so proud.

How To: Rational and Irrational Numbers

Rational numbers can be written as a fraction or as a/b. The "b" in a/b cannot be zero because you can't divide by zero. an example is 1.5. 1.5 can be written as 3/2/ Irrational numbers are numbers that can't be written as a fraction. A famous irrational number is pi. You can use this as a subject if you're a math teacher. Here is a video to help understand.

How To: Make a 'Flex Mex'—A Mathematically Delicious Hexaflexagon Burrito

Here's a great excuse to play with your food—and learn some math while you're at it. We've all seen a hexaflexagon folded out of paper, but how about a burrito? Vi Hart, a "mathmusician" over at the Khan Academy, came up with the Flex Mex, a burrito folded into a hexaflexagon with all the toppings inside. The spreadable ingredients (guacamole, sour cream and salsa) go inside the folds, then it's topped with beans and cheese.

News: Crack a Master Lock Mathematically, Without a Shim

Apparently it is possible to reduce 64,000 possible Master Lock padlock combinations down to just 100. The entire process is clearly illustrated in the below how-to from Mark Edward Campos. For an enlarged version, click here. Looking for something a little more interactive? We have loads of lock-picking tutorial videos. Here's one that demonstrates the same method (math as opposed to shim) outlined in the above illustration.

How To: Calculate Quick Math Problems Right from Android Nougat's Quick Settings

Android Nougat has a new API that lets apps create their own custom Quick Settings tiles. A similar feature was buried in Android Marshmallow, but that required a hacky workaround, and most manufacturers disabled it in their custom versions of Android 6.0. But since this is an official API now, all phones that run Android 7.0 and higher should be able to use custom Quick Settings tiles going forward.