Math-how-to

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 : 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

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

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

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 : 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 : 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 : 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

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

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 : 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

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 : 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

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

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 : 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 : 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

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

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

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 : 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

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 : 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 : 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

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 : Use ANOVA with a TI-83 graphing calculator

Need to know how to use your Texas Instruments graphing calculator for your college math or statistics class? You're in luck... watch this video tutorial to see how to use ANOVA with a TI-83 graphing calculator. What is ANOVA? One-way Analysis of Variance. Researchers at Purd ...more

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