Math Knowing Search Results

How To: Survive and Thrive in the Victorian Era

I don't know how many of you had this experience in your youth, but when I was a kid, I used to actively think about what would happen if I suddenly woke up in a fantasy land, or were to pass through a portal into another space and time. I knew it wouldn't really happen, but when you're a kid, these can be important issues to you. So I slept with my glasses on every night, just in case. Photo from George Pal's The Time Machine.

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 course, these hacks aren't limited to folks just looking to open their own locks, but let's just assume that's what you're here for.

How To: There's a Hidden Scientific Calculator on Your iPhone

The Calculator app on your iPhone may seem boring and basic, but there are a few interesting tricks worth knowing. You can ask Siri to perform calculations for you, long-press on results to copy them, long-press the field to paste numbers in, and swipe left or right above the keypad to delete digits one by one. The app can also be used as a scientific calculator with just a simple maneuver.

How To: Use the divisibility rule to test if a large number is divisible by 3

If you're looking for an easy way to determine if a number is divisible by 3, then look no further than the divisibility rule. It's a shorthand way to tell if any given number can be divided by 3, without actually performing the division. Take the number in question, and if the sum off all the digits is divisible by 3, then the original number will be, too. There are four examples in this math video.

How To: Use simple interest and compound interest in algebra

In this math lesson you will learn about simple interest and compound interest. Whenever you want to borrow money from a bank, you have to pay interest at a certain percent rate. The main difference between compound and simple interest is the fact that the simple interest is paid only on the principal, while the compound interest is paid on both the principal and the accumulated interest The simple interest is given by the following formula:

How To: Find the slope of a line in mathematics

Need to know how to calculate the slope of a line? This free video algebra lesson will teach you everything you'll need to know. 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 big test).

How To: Replace your measuring tape with sonic measuring

Replace your measuring tape with this new product. Tim Carter of AsktheBuilder.com demonstrates how a new sonic measuring device makes any job easier. Almost all home improvement jobs will involve measuring. You can use a tape measure which will give you 10-30 feet or a tape rule which will extend up to 100 feet. Using a tape measure may require a second person to hold the tape. You can now use a sonic measure, also called a digital tape measure, which you can do by yourself. Just aim from on...

How To: Do metric conversions in pre-algebra

Lawrence Perez, from Saddleback College, and his assistant Charlie, give this pre-algebra three-part lesson on metric conversions. Why can't we all use the same system of measurement, who knows? But until we see this day, you'll need to know how to do this.

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. You then cut slices out of the edges of the paper, and unfold to find that you have created a snowflake. The resulting snowflake has four lines of symmetry and looks something like this: If you fold it in half diagonall...

How To: 11 New Features on iOS and iPadOS 18 That'll Make Apple Notes Your Go-To Productivity App

Still on the fence about Apple's native Notes app? The latest Notes update for iPhone, iPad, and Mac is about to change your mind. With some fantastic new features and plenty of valuable tools from previous software versions, Notes is becoming a clear winner when it comes to saving important information from your personal and professional life.

News: The Best New Siri Features & Commands in iOS 13 for iPhone

Apple's latest update for iPhones, iOS 13, introduces over 200 new and exciting features. Many of those changes come to Siri, resulting in a better, more useful version of the digital assistant we've known for years. If you simply look at iOS 13's webpage, however, you wouldn't realize just how much Siri has changed this time around. We're here to fill in the blanks.