Divide Without a Calculator

It's that time of the year again when scores of students are flocking to stores for school supplies. Pens, pencils, books, and for math students, calculators. Graphing calculators like the ubiquitous TI-83 (and 84) series have been a staple of high school and college math cla ...more

Adding and subtracting may be the easiest of mathematical operations, but once you get it down, multiplication and division can be just as easy. That's why it's called elementary arithmetic. If it were harder, it would be called college algebra or trigonometry. But it's not— i ...more

Math Craft admin Cory Poole posted instructions on How to Make a Cube, Octahedron & Icosahedron from Sonobe Units, plus some great complex models in his article, How to Make a Truncated Icosahedron, Pentakis Dodecahedron & More. These models use the standard sonobe unit and a ...more

WonderHowTo is made up of niche communities called Worlds. If you've yet to join one (or create your own), get a taste below of what's going on in the community. Check in every Wednesday for a roundup of new activities and projects. Thanks to all of our active moderators and ...more

If you’ve watched The June the Homemaker Show, you’ve heard me mention once or twice that I’m a vegetarian. Over the course of my restricted diet eating, I’ve noticed that vegetarianism is a touchy subject among vegetarians and carnivores alike, particularly in meal-type situa ...more

In this video, we show you how to get easy, loose, carefree waves in four steps. Use a curling iron without the clamp to make sure you waves are crimp-free. Tools You can get a "clampless" curling or a regular one and not use the clamp. Example: Hot Tools one-inch curling ir ...more

2 + 2 = 4. That's about as much math as I can handle without a calculator on a daily basis. I literally hate doing math more than anything in life, mostly because I'm not good at it—and I hate doing things I'm not good at. So, when I come across a cool math trick online that ...more

In this how to you will learn about proportions. A proportion is comparing two ratios. Here is an example of a problem. First, you cross multiply and show your work. Next, you simplify. After, in order to get the variable alone, you divide each side by four. Since you can't di ...more

Have you ever felt like you wanted to totally annihilate someone in Minecraft with a machine gun? Yeah, me, too. Thankfully, you can! The redstone machine gun, which I'll demonstrate, is essentially just a rapid pulsar attached to a dispenser full of arrows. This design has b ...more

Last year, the Washington Post's Ashley Halsey wrote an article on what really happens to your luggage at airports. In it, they unwittingly published a photo of the master keys the TSA uses for TSA-approved baggage locks. Now, thanks to that picture and a French lock-picking e ...more

Spotlight, Apple's system-wide search feature, lets you search for apps, contacts, messages, webpages, music, notes, and other content that's on and off your iPhone. On iOS, it's known as "Search," and you can access it by swiping your home screen down or swiping open the Toda ...more

Welcome back, my novice hackers! It has become clear from some of your questions that quite a few of you are unfamiliar with the hexadecimal system, or simply, hex. The hexadecimal system is used throughout computing and if you have never studied this Base16 numering system, ...more

Solving long and extensively complicated equations in grade school was tough to do by hand. Keeping track of which part of the equation to solve first took time, training, and lots of bad grades. As soon as middle school began, our dependance on calculators grew and difficult ...more

Update (Fall 2020): Samsung's version of Android 11 is already in its testing phases! One UI 3.0 is expected to hit recent flagship Galaxy devices towards the end of this year, so check out the new list of features: New Version: All the New Features & Changes in Samsung's One ...more

Look, tests are no fun, and doing poorly on them is rarely an option. Whether you're studious or a slacker, everyone needs a little boost now and again. While students have found ways to cheat as long as tests have existed, the invention of smartphones has greatly enhanced the ...more

Apple doesn't include a calculator on the iPad and never did. One almost appeared over 12 years ago but was nothing more than a blown-up version of the iPhone app. Since then, the company still hasn't made an iPad-optimized calculator, and there is no shortage of third-party a ...more

I've been an Android user almost as long as the operating system has existed, so when I received my first iPhone in April, I felt like I was in a foreign land. Sure, it runs most of the apps I'm used to, and the phone itself feels about the same in my hand as any similarly-siz ...more

With over 8 million active users, CyanogenMod is definitely the most popular ROM for Android devices, which explains why venture capitalists invested $7 million last month for future development. Still, not everyone is willing to root their smartphone or tablet to install Cya ...more

Sometimes you need more than just your brain to split the bill at a restaurant or to calculate how much your cable company is ripping you off. If your math skills are shaky like mine, or you just want to make sure you're unequivocally correct with your calculations, you obvio ...more

Let's set the scene: you're at home, it's late in the evening, and you have a hankering for those deliciously decadent chocolate-wrapped squares of ice cream goodness. You could drive to the store and pick up the usual pack of Klondike Bars in the ice cream aisle... or, you ca ...more

When the Galaxy S6 hype-train was building momentum ahead of the phone's release, many reports had Samsung cutting back on its much-maligned TouchWiz skin. In the end, these reports were either highly exaggerated or entirely fabricated, because while not as egregious as previo ...more

Google's got a hit on its hands with this one. Android 5.0—AKA "Lollipop"—will be making its official debut next month, but a new preview build has given us a glimpse into the future, which looks brighter than ever. New accents, beautiful animations, and a lighter overall col ...more

Contrary to popular belief, augmented reality apps have been available for a while now. I remember using the Layar app (still available for iOS and Android) to explore nearby businesses and landmarks with varying success via an early-generation Android handset. It would be ha ...more

This year's Google I/O brought the announcement of Android L, as well as the Preview builds of L for the Nexus 5 and Nexus 7 (2013), installed using either ADB on Windows or fastboot on any computer. Unfortunately, those of us without a Nexus device are out of luck—but not ent ...more

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 ...more

Samy Kamkar, the security researcher known for the MySpace Worm and his combination lock cracking skills (using an online calculator), is back—and this time, he's after your credit cards! Well, not really, but his latest project, dubbed MagSpoof, can spoof any magnetic stripe ...more

Let's say you're using your iPhone's Calculator app, and you're knee-deep into a complicated calculation with many steps. You type in a large number, for example, "123,466,789," but mess up. You meant to type "5" midway through but accidentally typed "6" instead. The only thin ...more

When I was 12, for some mysterious reason, my dad put my little brothers and me in charge of cooking the Thanksgiving turkey. Naturally, my brothers and I spent the rest of the day playing hide-in-seek in the backyard and forgot all about the humble bird defrosting in the sink ...more

With all of the bare-bones setup out of the way in our Mac for Hackers series, your Apple machine should be ready to run a significant amount of pentesting tools. We can pull tools from GitHub and compile them, we can pull dependencies or tools from Homebrew, we have both Pyth ...more

There is no iPad version of Apple's Calculator app, so you won't find it on your Home Screen, in your App Library, or as a shortcut in the Control Center. But that doesn't mean your iPad doesn't have an official calculator. Before the first iPad in 2010, Apple's development t ...more

You may not know it, but the IPv4 address of your computer contains tons of useful information about whatever Wi-Fi network you're on. By knowing what your IPv4 address and subnet mask are telling you, you can easily scan the whole network range, locate the router, and discove ...more

Learning Style What kind of learner are you? There are three different ways people learn: Auditory learner: A person who learns best by listening. This type of person will benefit best by finding someone to study with, to ask each other questions, and to read the study mater ...more

In my last guide, I showed how you could crack the combination of any Master Lock combination padlock in 8 tries or less using my online calculator. Now, as promised, I'll be showing you how I devised the attack, which is based off the well-known technique that reduces the 64, ...more