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What Is Number Theory?

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For many of us, a number is just a number, a bit of information that tells you, say, what time it is. But mathematicians look at that same number and divine relationships that underlie nature itself. Ready to enter the trippy world of number theory?

What Is Avogadro's Number?

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That's one seriously big number, and technically Amedeo Avogadro didn't even come up with it. So how did the Italian chemist make such an indelible (numerical) mark on the wonderful world of chemistry?

What Are Prime Numbers, and Why Do They Matter?

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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?

What Is the Real Number System?

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

What Are Imaginary Numbers?

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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.

How to Make a Number Line for the Classroom

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A number line is a pictorial representation of real numbers. It is most commonly used in elementary math classes to help students compare numbers and perform arithmetic operations like addition, subtraction, division and multiplication.

What Is the Biggest Number? 6 Astronomical Contenders

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As a child, when trying to come up with the biggest number possible, you might have said "infinity plus one." While technically infinity is the largest number because you cannot run out of numbers, the biggest numbers that we know of are still difficult to count but a bit more quantifiable.

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