# Math-how-to

### How To : Find the 100th term in a sequence

Need to find the nth term in a given arithmetic sequence? See how it's done with this free video math lesson. Need help finding the From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. ...more

### Gaming : The 9 Best Games to Play When You're Taking a Dump

My bathroom is like my own private arcade room. Whenever I'm seated comfortably on the toilet, no one is going to disturb me, so I can play anything I want on my smartphone. You probably do it, too — and your parents, kids, friends, colleagues, and boss — so don't be afraid to ...more

### News : Scrabble Finally Hits Android Devices... But Does It Beat Words with Friends?

Three years ago, Scrabble was one of the very first 500 mobile applications to appear on the new iTunes App Store, allowing iPhone users the chance to kill their Scrabble cravings on the go. It was a smart move for Hasbro and Electronic Arts (EA), but it's been two years and e ...more

### Mastering Security, Part 1 : How to Manage and Create Strong Passwords

I've seen numerous tutorials on how to create a "strong" password. This makes me laugh. These titles imply "one" password, which is wrong in and of itself. A person should have many passwords, all different, and all extremely long. People may ask how they're supposed to rememb ...more

### Math Craft Monday : Community Submissions (Plus How to Make a Sliceform Hyperbolic Paraboloid)

It's Monday, which means once again, it's time to highlight some of the most recent community submissions posted to the Math Craft corkboard. I also thought we'd take a look at building a sliceform model of a hyperbolic paraboloid. Rachel Mansur put up two posts on her Modula ...more

### How To : 8 Reasons Why You Should Never Throw Away Eggshells

The other day I was doing the math on roughly how many eggs I eat each year. I estimated about 500. That's a lot of eggs. And, subsequently, that's a lot of eggshells to throw in the trash. I felt weird realizing that I trash about 500 eggshells a year. And it wasn't the envi ...more

### How To : Fold a Pentakis Dodecahedron

Math Craft admin Cory Poole provided quite a few recipes for sonobe models in his blog, and I followed one to make the pentakis dodecahedron here. I wasn't that happy with my first result because the colours kept on coming out wrong—i.e. two of the same colour next to each ot ...more

### How To : Solve a probability math word problem

In this lesson, you will learn how to solve a probability word problem. Need help with your algebra and geometry? Well... P(event)= Number of favorable outcomes / Total number of outcomes In the above problem, the number of favorable outcomes is 4 because there are \$ blue ma ...more

### How To : Spend Money on a Graphing Calculator? Nah—Just Use This Web-Based TI Emulator

For the majority of my math classes in middle and high school, a graphing calculator was a must. While the calculators were very useful to have, they were quite steep in the price column. After losing the TI-83 graphing calculator my parents bought me in high school, I had to ...more

### How To : Make These Sonic Distance Sensors for the Bad Driver in Your Life

Today's fancy cars come with all sorts of options, from power mirrors to working seat belts. Some of us condemned to live in the reality of capitalist recession have no car, or perhaps a very modest one. But your modest car can still have some cutting edge technology wedged in ...more

### How To : Make an egg drop and learn the physics behind it

The egg drop has become a sort of rite of passage for gangly fourth graders as they embark on their first journey into physics and math before they approach these subjects again later on in middle school and high school. The egg drop is a test of intellect as much as it's a r ...more

### How To : Use a TI-89 to calculate nCr

This video shows you how to do a mathematical representation on computing the nCr function using a TI-89 calculator. You can write the nCr notation in different forms. It can be simplified from nCr to C(n,r). The symbol can either be read "n choose r" or "n taken r at a time" ...more

### How To : The 5 Best Apps for Streaming Movies on Your Phone

There are more than a few subscription-based movie streaming apps available for Android and iPhone, each with different benefits and varying pricing plans. Needless to say, it can get expensive fast if you sign up for multiple services because you can't decide on what's best. ...more

### Cook Like a Chef : Use Ratios, Not Recipes

Recipes are invaluable to cooks who are just starting out, but what if you want to get to the next level? Then it's time you learn how to apply simple math to food. In other words, learn how to cook using ratios, not recipes. Fortunately, there's a great book by cookbook auth ...more

### How To : Cheat on a math test using a calculator

In this tutorial, we learn how to cheat on a math test using a calculator. The first way to cheat is to go into your calculator where the programming is. After this, you can type in the information that you need to store into the calculator and then save it to look at later. T ...more

### How To : Sew basket liners without a pattern

Check out this DIY video tutorial from Curbly, the best place to share pictures of your home, find design ideas, and get expert home-improvement advice. A basket without a basket liner looks kinda naked, but sewing them can be a bit tricky, especially when you factor in those ...more

### How To : Work with linear, quadratic & exponential models

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 ...more

### How To : 18 Tips & Tricks to Help You Master Your Google Pixel

Google's new Pixel and Pixel XL flagships are some very powerful smartphones, but as with any high-tech gadget, they're only as capable as the user allows them to be. So if you're a proud new Pixel owner, it's time to bone up on a few new features to help get the most out of y ...more

### How To : Use the Remaining Tiles Bag to Score Big in Words with Friends

No matter which version of Words with Friends you're using on Android or iOS, you have access to built-in features such as Word Radars and Swap+ powerups. These tools are considered cheating by most die-hard word gamers, especially since not everyone can use them. But there is ...more

### How To : Solve combination and permutation problem

Check out this instructional math video that demonstrates how to solve combination and permutation math problems. In the 16th lesson, learn how to solve SAT problems using the Official SAT Study Guide. Here are the math problems and their page numbers that this video covers: ...more

### News : Math Craft Inspiration of the Week: The Kinetic Wave Sculptures of Reuben Margolin

Reuben Margolin builds large scale kinetic sculptures based off of mechanical waves. Some of his sculptures contain hundreds of pulleys all working in harmony with each other to create sinusoidal waves and their resulting interference patterns. He designs them all on paper and ...more

### How To : Calculate incentive rates by formula in MS Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 39th installment i ...more

### News : More String Art

I was browsing Reddit.com yesterday and noticed this post. User guyanonymous (yes I am really crediting him regardless of his name!) had posted up this string-art picture which has parabolic curves created from straight lines and gave me permission to post it up here on the co ...more

### How To : How Old Are You on Mars and Venus? Learn How to Convert Earth-Years Across Our Solar System

Let's say today is your birthday. You've just put those boisterous, vicenarian times behind you, reaching the first big step to your upcoming midlife crisis—30 years old. Maybe this is your midlife crisis. After all, if you're not where you want to be in life when you join the ...more

### Staying Ahead of the Curve : Building the Next Great Minecraft Creation

Minecraft is unique among computer games in that some users have created such breathtaking works of beauty and ingenuity that it challenges the very idea that Minecraft is even a game at all, but suggests that it is instead a tool for artistic expression much like Photoshop. ...more

### How To : Calculate income tax payroll deductions in MS Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 42nd installment i ...more

### How To : Simplify surds (improper square roots)

Could you use a little help figuring out how to simplify numbers left in square root form? Watch this free video lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks ...more

### How To : Express a ratio as a fraction in simplest form

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. With this installment from Internet pedagogical sup ...more

### News : Math Craft Inspiration of the Week: The Curved Geometric Paper Sculptures of Richard Sweeney

Richard Sweeney is an incredible artist whose body of work consists mainly of sculptures made from paper. His art is often related to origami, and much of his work is related to geometrical forms. I personally really love his modular forms in paper. Many of them are based off ...more

### How To : Solve word problems involving domain and range

See how to find the domain and range of a function implied by a word problem with this free video math lesson. 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 In ...more

### How To : Win at QuiBids Auctions—Which Might Just Mean Stay Away

If you're looking to acquire the newest iPod model or latest Xbox without breaking the bank, your first stop would probably be eBay, maybe even the Amazon Marketplace, or any of the other reputable online marketplaces and auction sites. But you probably haven't hit up the penn ...more

### How To : Create elaborate drawings on a graphing calculator

Texas Instruments is one of the best known companies for creating graphing calculators. In this video tutorial you will see how to use a little known feature that lets you create pretty elaborate drawings on it. This is a great time-waster in math class! Who needs algebra or g ...more

### How To : Subtract a mixed number from a proper fraction in basic math

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. With this free math tutorial, you'll learn how to s ...more

### How To : Calculate APR, EAR & period rates in Microsoft Excel 2010

As you might guess, one of the domains in which Microsoft Excel really excels is finance math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, part of his "Excel Fina ...more

### How To : Make basic balance sheet calculations in Microsoft Excel

As you might guess, one of the domains in which Microsoft Excel really excels is finance math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 9th installment in ...more

### How To : Calculate Type I (Type 1) errors in statistics

Need a quick primer on how to solve type-1 error problem in stats? Let this video be your guide. 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 e ...more

### How To : Isolate a variable

If you're struggling a bit with algebra, check out this video to learn how to isolate a variable. Isolating a variable is a matter of separating and simplifying. Step 1: Bring like terms together Bring like terms together. All equations have two sides. You want to perform t ...more

### How To : Simplify radicals which are not perfect squares

Need help reducing radical expressions without perfect square or cube roots? Take heart: this free math lesson will ensure that you know everything you need to know for that next big test. Examples include square roots, cube roots, and 4th roots. You'll also learn a technique ...more

### News : Want to Play More Minecraft? This Teacher Will Show Your Parents Its Educational Side

A game labeled as 'educational' usually spells its death among hardcore gamers. The educational game genre is mostly intended for children, and games that appeal to children often lack the sort of widespread appeal that makes them commercially successful. Many people play gam ...more

### Buyer's Guide : Top 20 Hacker Holiday Gifts of 2018

For the uninitiated, it can be difficult to buy that special hacker in your life a perfect holiday gift. That's why we've taken out the guesswork and curated a list of the top 20 most popular items our readers are buying. Whether you're buying a gift for a friend or have been ...more

### How To : Solve simple interest algebra problems

In this math lesson we will learn how to solve problems involving simple interest. When you deposit money in a savings account, the bank pays you interest at a certain rate called interest rate. There are two types of interest: simple interest and compound interest. In this l ...more

### How To : 12 Genius Last-Minute No-Sew Costumes for Halloween

If you haven't come up with a funny, innovative costume yet for Halloween, you're running out of time. While all your friends are busy perfecting their month-long DIY costume project, you're still being lazy about it and have just now started to search online for ideas. But t ...more

### How To : Say the names of school things in French

Watch to learn how to say the names of things that have to do with school, like books, paper airplanes, and soccer balls, in French. un abecedaire - alphabet book un avion en papier - paper airplane un ballon de foot - soccer ball une boite a compare - pencil box un cahier - w ...more

### How To : Multiply Any Number by 11 with a Super Fast Mental Trick

Most of the time, when I’m bored during math class, I play with my calculator to satisfy my boredom. Recently, I've discovered that when multiplying any number by 11, 111, or any number similar to it, that it has a pattern (though I guess everything in math has a pattern). I d ...more

### How To : Find a percentage of a whole number in basic math

Need help figuring out how to find a given percentage of a whole number (e.g., 16% of 736)? Watch this free video lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thank ...more

### News : Top 104 Amazing Photographers to Circle on Google+

We've provided Google insiders, Google's community managers, authors, and celebrities for you to add to your circles. This week, we've discovered over 100 brilliant photographers for you to follow. Google+ is a great showcase for professional photographers. With in-house edit ...more

### How To : Solve basic linear function word problems in algebra

Need some help solving linear function word problems? See how it's done with this free video math lesson. Need help finding the From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, ...more

### How To : Calculate monthly retirement income in Microsoft Excel

As you might guess, one of the domains in which Microsoft Excel really excels is finance math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 12th installment in ...more

### 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 the ...more

### How To : FarmVille Crafting Building Mastery, Crafting Co Op, and Recipe Guide

Here are some charts I made to help you master crafting recipe levels. Don't forget to note the rewards at the bottom of each chart! If you need an overview of what Crafting Mastery is, check out the official Farmville blog post here. I have taken the information from their c ...more

### How To : How Long Would It Take to Crack Your Password?

If you have any doubt about how secure that strong password you created really is, there's an easy way to check online. Just visit HowSecureIsMyPassword.net, which uses a combination of math and statistics to determine how long it would take for a PC to crack your password. It ...more

### HoloLens Dev 101 : How to Get Started Creating for Windows Mixed Reality

Many new developers are diving right into the Microsoft HoloLens, but augmented and mixed reality are fairly big subjects in terms of learning. There's a lot to cover and, unfortunately, very few places for someone brand new to Windows Holographic to begin lessons. Daily—and ...more

### How To : Crack the combination on a combination lock with no math

Combination locks are a major part of life for people High School, the Armed Services, and enough other places to make this video very useful to a lot of people. It will show you how to open any twisting combination lock (like a Masterlock) with using math or any other sophist ...more

### How To : Calculate the modulus and argument of a complex number

Need a little help with your math homework? No problem, the Math Centre offers students video tutorials that will provide as a reference guide for self-study. Students get self-study resources targeted to the needs of individual courses, and teachers gain generic mathematics s ...more

### How To : Solve ratio problems

Check out this instructional math video that demonstrates how to solve ratio problems. In the 14th lesson, learn how to solve SAT problems using the Official SAT Study Guide. Here are the math problems and their page numbers that this video covers: - p472 #6 - p843 #16 - p535 ...more

### How To : Normalize a data set into another scale

Comparing evaluations of the same thing done on different scales can seem difficult, but there is a simple equation you can use to translate something expressed in one numerical scale into another. This video will show you how to use it and make your math life easier.

### Modular Origami : Icosahedron, Octahedron & Cube

I spent the holiday weekend becoming fluent in the basics of modular origami. With practice, you can churn out the below models surprisingly quickly. Icosahedron, Octahedron & Cube. My first attempt at the octahedron can be seen here, which I found was actually a bit tougher t ...more

### How To : Calculate Tips Faster on Your iPhone Using the Shortcuts App

When it's time to calculate a tip at a restaurant or bar, I usually try some mental math at first, but sometimes I resort to opening the Calculator quickly from the Control Center on my iPhone and doing a quick calculation. But with Apple's Shortcuts app, there's an even easie ...more

### How To : The Essential Newbie's Guide to SQL Injections and Manipulating Data in a MySQL Database

No doubt you've seen some of the hack logs being released. One part that stands out over and over again is the heavy database usage. It used to be early on that virus and hackers would destroy data, usually just for lulz. However, with the explosive commercial growth of the In ...more

### How To : Calculate stock prices with the dividend growth model in Microsoft Excel

As you might guess, one of the domains in which Microsoft Excel really excels is finance math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 65th installment in ...more

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