Math-how-to

How To : Create Parabolic Curves Using Straight Lines

Curve stitching is a form of string art where smooth curves are created through the use of straight lines. It is taught in many Junior High and High School art classes. I discovered it when my math students started showing me the geometric art they had created. The process of ...more

How To : Calculate Faster Than a Calculator

When you need to crunch numbers quickly — and I mean really quickly — there's a cool method you can use to multiply two numbers together in just a few seconds. This is great when you need to speed through multiplication homework, and is also good for impressing your math teac ...more

How To : Unlock Any Master Lock Combination Padlock

Let's say you forgot the code to your Master Lock combination padlock. What can you do besides buy another one? Well, there's a surprising abundance of ways to open a combination lock other than with just the combination, some of which will even let you reset the code. Of cour ...more

How To : Find the Percent Given Two Numbers

Whether you're shopping for deals, need help with a little math, or any number of other occasions, it's a valuable skill to know how to quickly figure out a percentage given two numbers. Let's say you're shopping and you come across a pair of shoes that are normally $45, but ...more

How To : Remember "greater than" & "less than" symbols

This video shows you how to easily remember "greater than" and "less than" math symbols. The first thing you have to remember is that "less than" symbol looks like the letter L ("less than" symbol is "<"). When you see this sign, remember that < looks like L and means "less th ...more

How To : The Best Phones for Rooting & Modding

According to a study done by Kaspersky, 7.6% of Android users root their phones. That may not sound like a lot, but with over 2 billion Android devices out there, the math works out to over 150 million rooted phones — more than the total population of Russia, Mexico, or Japan ...more

How To : Master SCRABBLE & Win Every Game

SCRABBLE. To some it's just a game, but to me it's life or death. Well, not really, but it feels that way anyway. On a normal weekend, a game becomes much like Jon Thomas' "friendly game of death Scrabble." Video: . When I'm playing a game of SCRABBLE, my friends are not frien ...more

How To : Graph Mario on a TI-83 Calculator

When it comes to graphing and comparing functions, the TI-83 graphing calculator is the end-all device for math and science students. But one of the most entertaining aspects of Texas Instruments' powerful algebraic and trigonometric calculator is not the equations themselves, ...more

How To : Mine Bitcoin and Make Money

Bitcoin is a new currency built off "Satoshi Nakamoto's" (alias) 2008 Bitcoin white-paper. Bitcoin provides its users with a way to make peer-to-peer (P2P) transactions without having to use a bank as a mediator. There is no middle man, no corporation backing it, and no one ha ...more

How To : Guess how many candies are in a jar

Want to win the prize? Knowing a little math is the key to winning this popular contest. In this video, learn how to estimate correctly. You Will Need: • A jar filled with spherical or oblate spheroid candies • Calculator • Tape measure • Vernier calipers (optional) • Co ...more

How To : Multiply & Divide Numbers (Basic Elementary Math)

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

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? W ...more

How To : Find the Slope Given 2 Ordered Pairs

Slope is the change in Y over the change in X. Written out, the formula looks is as follows: (y2-y1) ——— (x2-x1) It's a simple formula that just requires you to input your coordinates to calculate the value of the slope. Values are generally notated as such: (x1,y1), (x2,y2 ...more

How To : Be a human calculator

Before we had the calculator and before we had the abacus we had the human brain to complete our math problems for us. Remember that? Well, it seems that few of us do, resorting to calculators on our phone for elementary subtraction problems and multiplication. Strengthen you ...more

How To : Make a Hyperbolic Paraboloid Using Skewers

In Monday's post, we created a sliceform model of a hyperbolic paraboloid. In today's post, we will create a similar model using skewers. The hyperbolic paraboloid is a ruled surface, which means that you can create it using only straight lines even though it is curved. In fac ...more

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). T ...more

How To : Crack a master lock (not pick) to get the combo

Just like the title says, learn how to crack a master lock. Not pick the lock (picking a master lock will not get you the combo). You don't need any special tools to crack this master lock- all you need is the right technique. Crack master locks for fun only - don't use this f ...more

How To : Do bank reconciliation in Microsoft 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 37th installment i ...more

How To : Make 6-Sided Kirigami Snowflakes

We've all made them. I remember making hundreds of paper snowflakes when I was in elementary school. You take a piece of paper and fold it in half, then fold it in half again. You now have a piece that is one fourth the size of the original. Now you fold it in half diagonally. ...more

Hack Your Brain : Improving Memory with Dirty Pictures

If you're interested in nabbing superhero memory strength, the secret behind training your brain is not necessarily what you might expect. Your standard G-rated brain strengthening exercises range from crossword puzzles to Sudoku to calculating fairly simple math problems to i ...more

How To : Always win a card game using a bit of math

Use this rigged game to cheat your friends twice in a row! The game functions just like 31, only this time you'll always win if you follow the instructions in this video. From Revision3: This week we're learning a rigged game that combines principles we learned from both the ...more

How To : Solve percentages without a calculator

Want to know how to find percentages quickly without the use of a calculator? It's easy. This free video math lesson will show you how it's done. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to ...more

How To : Play Mancala

Math skills and strategic planning are essential to winning this ancient African game. You Will Need * A mancala game board * Two players * 48 game pieces – or, "stones" Step 1: Set up Place the mancala board lengthwise between two players and put four stones in each of the 1 ...more

How To : Calculate math without a calculator

Before the calculator and even the abacus was invented, there was a little instrument called the human brain that we used to do math. Remember that? While most of us turn to our trusty Ti-84s to do calculus homework or whip out our cell phone calculators to determine how much ...more

How To : GPU Accelerate Cracking Passwords with Hashcat

How to Crack Passwords Faster by Putting Your GPU to Work with HashcatSecurity on the internet is always changing. Not too long ago, having a 10 character password meant that you were safe from all forms of hash cracking. Hash cracking is when you take a string of characters t ...more

How To : Measure the volume of a balloon

Here we will demonstrate how to measure the volume of a balloon. A balloon is not a straight edged polygon shape, usually, so the mathematical equations get that much harder, on the flip side, it may be a spherical or ovalish shape, but measurements with math alone are detrime ...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

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