# Number Systems

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### 36 Fun Facts About the Number 36

Fun facts and mathematical properties of the number 36. Instances of thirty-six (36) in culture, science, math, pop culture, religion, and art.

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### Math Fun Facts About the Number 13

Do you avoid the number 13, or is 13 your go-to luck number? Thirteen has a rich history and has been singled out by many cultures around the world. In some religions it is a number with special significance, while...

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### Hexadecimal (Base-16) Divisibility Rules

Base-16 (hexadecimal) is used in computing, for example, encoding colors in HTML. Divisibility rules are simple tests you can perform on a number to check if it is divisible by another number, without having to perform...

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### How to Do Ternary or Trinary, Base 3 Number System Conversions - Includes Examples

Ternary aka Trinary aka Base 3 numerical system lesson and examples.

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### How to Write Numbers in English from 1 to 10,000

In writing, quantities greater than nine are usually described with digits instead of spelled out in words. For example, the number of people who bought tickets to a concert is given as "2,304" rather than...

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### 1000 Digits of Pi, e, and Other Irrational Numbers

Irrational numbers are those whose decimal expansion goes on forever without repeating. In other words, they cannot be represented by any rational number (fraction or whole number). Irrational numbers that are the...

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### How to Convert to Base-5

Most human civilizations settled on a base-10 or base-20 numbering system because human hands have 10 fingers, and our hands and feet have 20 digits. Considering we have five fingers on one hand, it's not such a stretch...

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### Sphenic Numbers. How to identify if a number is sphenic or not spenic.

A sphenic number is a positive whole number that can be written as product of three distinct prime factors. So in order decide if a number is a sphenic number or not follow these two simple steps: Step 1 Work out the...

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### HOW TO LEARN MATH EASILY

Simple things which makes magnificent changes in a way we learn math.

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### How to Do Duodecimal, Dozenal, Base 12 Number System Conversions - Includes Examples

How to calculate base 12 aka duodecimal numbers.

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