# Math Concepts

Math is often called the universal language because no matter where you're from, a better understanding of math means a better understanding of the world around you. Learn about math concepts such as addition, subtraction, fractions, ratios and more.

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### Radioactive! A Profile of the Element Plutonium

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### Why Distant Mountains Appear Blue to the Naked Eye

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### Learn More

With a little patience, you can master this trick of converting binary code to decimals — and have fun doing it!

By Mark Mancini

Both degrees and radians represent the measure of an angle in geometry. So, how do you convert one to the other?

By Mark Mancini

Most of the world uses meters, apart from the U.S. and a few other countries. So what's an easy way to convert from meters to feet and vice versa?

By Mark Mancini

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Finding the range of a set of numbers is an easy subtraction problem!

There was a time (4,000 years ago) when simply being able to add might get your name on a clay tablet or help you accumulate vast wealth.

By Dave Roos

Converting kilogram measurements into pounds is not hard. We'll show you the textbook way plus two quick-and-dirty shortcuts.

By Mark Mancini

Many people get speed and velocity confused. It's no surprise because the terms are often used interchangeably. But they're not quite the same thing. So how do you find the velocity of an object?

By Mark Mancini

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We'll show you both a quick and dirty way, and a precise, more complicated formula for converting a Celsius temperature to Fahrenheit (and vice versa).

Scientists have come up with a new formula to describe the shape of every egg in the world, which will have applications in fields from art and technology to architecture and agriculture.

Real numbers are the opposite of imaginary numbers and include every number you can think of.

A perfect square is a number, but it can also be explained using an actual square.

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Dividing fractions is easy once you learn a couple of rules and remember three words — keep, change and flip.

Multiplying fractions is easy — it just takes three simple steps!

An imaginary number is a value that's the square root of a negative number. It can't exist on a one-dimensional number line. We'll explain.

Sir Isaac Newton's Law of Universal Gravitation helps put the laws of gravity into a mathematical formula. And the gravitational constant is the "G" in that formula.

By Mark Mancini

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A unit circle is an important part of trigonometry and can define right angle relationships known as sine, cosine and tangent.

A multiplication table is an easy-to-use grid of numbers that can help you learn to multiply quickly by using the chart and, eventually, your memory.

Science requires that we make guesses, which is why we have confidence intervals.

Bayes' theorem describes the probability of an event, based on prior knowledge of conditions that might be related to the event. Sounds intimidating, but we'll walk you through it.

By Mark Mancini

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Rational numbers can be expressed as the ratio of two integers, while irrational numbers, such as square roots, cannot. So, why does the difference matter?

You may remember from math class that a prime number is a number that can only be divided by 1 and itself. But why are they important anyway?

A simple math problem may seem to some of us like an inscrutable pile of numbers and symbols, just waiting to trip us up. PEMDAS to the rescue!

By Mark Mancini

It's an important question, so come with us and we'll show you how to figure it out.

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Two lines that are perpendicular to the same line are parallel to each other and will never intersect.

By Mark Mancini

It's easy to make a Mobius strip with some paper and tape, but your mind will be blown by the mathematical concepts it unlocks.