# Two-digit

### How To : Divide a two-digit number into a three-digit number

With this free video math lesson, you'll learn how to do long division with double and triple-digit numbers. With mathematics, as with anything else, not everyone progresses at the same rate. Basic math is no exception. Happily, in the age of Internet video tutorials, this isn ...more

### How To : Divide a two-digit number into a larger number in math

Want to divide a two-digit number into a bigger number still? Learn how. 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 follo ...more

### How To : Hate Math? These Mental Tricks Will Have You Multiplying Faster Than Einstein Ever Could!

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

### How To : Divide larger numbers and do long division

This is video for how to divide large numbers by doing long division with easy methods. This video describes that dividing the "Dividend" with "Divisor" to get the "Quotient" and "Remainder" if they exist. In the given example first "25" taken as the Dividend and "5" is will b ...more

### Hack Like a Pro : The Basics of the Hexadecimal System

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

### How To : Use Leaked Password Databases to Create Brute-Force Wordlists

To name just a few companies, VK, µTorrent, and ClixSense all suffered major data breaches at some point in the past. The leaked password databases from those and other online sites can be used to better understand how human-passwords are created and increase a hacker's succes ...more

### How To : Hack 200 Online User Accounts in Less Than 2 Hours (From Sites Like Twitter, Reddit & Microsoft)

Leaked databases get passed around the internet and no one seems to notice. We've become desensitized to the data breaches that occur on a daily basis because it happens so frequently. Join me as I illustrate why reusing passwords across multiple websites is a truly awful prac ...more

### How To : Con someone with the penny prediction bar trick

Check out Brian Brushwood and Scam School's Penny Prediction scam. No matter what the setup, the very best scams are the ones that let the mark think they're on top, only to get punked in the end. That's what makes the penny prediction so great! THE SETUP: reach into your po ...more

### How To : 7 Easy Mnemonic Tricks for Remembering Numbers

Whether it's your credit card, your parents' new zip code, or a new work phone number, number sequences are everywhere. Sometimes it's important to actually remember them instead of always relying on a smartphone or the internet to remind you. For long number sequences, your ...more

### How To : Do long multiplication

In this video the instructor gives you sample as of how to SLEP long multiplication. You start by breaking the numbers up to simpler forms. If you have a two digit number that your multiplying by a another two digit number you multiply the first two digit number and then buy t ...more

### How To : Multiply 2 digit numbers using the grid method

This video shows the method to multiply two digit numbers using the grid method. First make a grid of three rows and three columns. Put a cross in the first row and first column or the (1,1) position. Separate the ones and the tens in the number. In our example 43 is broken in ...more

### How To : Easily multiply any two digit number by 11

You likely all know the 10 rule (to multiply by 10, just add a 0 behind the number) but do you know the 11 rule? It is as easy! You should be able to do this one in your head. Learn how to easily multiply any two digit number by 11. Easy way to do math fast!

### How To : Use two digit numbers in Arabic

In this video, we learn how to understand two digit numbers in Arabic. Start off by having numbers written out in Arabic on a screen in front of you. Guess what these numbers are and how you say them. After this, have the answer come out on how to say the number and what it is ...more

### How To : Add two digit numbers

Addition got you down? An expert instructor from Khan Academy walks you through the mysteries of adding two numbers together by breaking it down into easy to understand terms. Fun animated chalkboard examples make it easy for kids and adults alike to learn how to add. Also dem ...more

### How To : Crack Any Master Combination Lock in 8 Tries or Less Using This Calculator

Master Lock combination padlocks have been known to be vulnerable to an attack that reduces their 64,000 possible combinations down to 100. I've devised a new attack for cracking any Master combo lock that simplifies the process and reduces the amount of work down to only 8 co ...more

### How To : Find Anyone's Private Phone Number Using Facebook

Facebook really wants your phone number, nagging you for one as soon as you join. This isn't all bad since it can help secure your account with two-factor authentication. On the flipside, this makes it easy to reveal the private phone numbers of virtually anyone on Facebook, i ...more

### How To : Unlock Your iPhone Using the Current Battery Percentage as Your Passcode

With countless images and messages packed into one small device, security is always a high priority amongst iPhone users. For this reason, we've previously shown you how to make your iPhone's passcode match the current time, which made figuring out your passcode a lot more dif ...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 : Over 4 Million Snapchat Accounts Have Been Compromised—Is Yours One of Them?

Just days after news spread that Snapchat could be exploited by spammers, an anonymous group of hackers have released the private information of over 4 million users of the popular photo-sharing application. Containing both username and phone number pairings, SnapchatDB! has ...more

### Hack Like a Pro : An Introduction to Regular Expressions, Part 2

Welcome back, my hacker novitiates! A short while ago, I introduced you to regular expressions. Regular expressions are a language that is particularly useful for finding complex text patterns in streams of data. Although first developed for Perl, regular expressions are use ...more

### How To : Calculate percentages by example

In this tutorial the author explains of how to find percentages using examples. He explains that x percent of some number y is x multiplied by y and divided by 100. He goes on and explains this concept with numerous examples. He suggests a short cut to movie the decimal point ...more

### How To : Create an array for a stem-and-leaf chart in Excel

New to Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. With this video tutorial from ExcelIsFun, the 376th installment in their series of digital spreadsheet video tutorials, you'll learn how to an array formul ...more

### How To : Find the percentage of a number

In this tutorial the author explains of how to compute percentages of a given number. He explains that x percent of some number y is x multiplied by y and divided by 100. He says that of means multiply and percentage means for hundred. He goes on and explains this concept with ...more

### How To : Do the hot seat card trick

Brian Brushwood teaches you how to do the hot seat card trick. You need a regular deck of cards and the 10th card from the top should be the 3 of spades. The spectator chooses a number between 10 and 20. He takes the cards and deals down that amount of cards from the top. Next ...more

### How To : Convert between fractions, decimals, and percents

In this tutorial the author explains of how to find out percentages of a given number. He explains that x percent of some number y is x multiplied by y and divided by 100. He goes on and explains this concept with numerous examples. He suggests a short cut to move the decimal ...more

### News : One Number to Rule Them All! T-Mobile (Finally) Brings 'Digits' to Every Customer

The roll-out of T-Mobile's hotly anticipated 'Digits' service is now underway. For those unfamiliar with what could be the un-carrier's next killer app, 'Digits' is basically a combination of Google Voice and AT&T NumberSync. With it, T-Mobile customers can use their number a ...more

### How To : Find the aabb square

This video presents a mathematical puzzle which is to be solved by the viewer. The solution is posted in an alternate video, but this video presents the problem of a four digit number which is the square of a smaller number. The first two digits of the square are the same as e ...more

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