# Basic Math & Pre-Algebra Extras For Dummies

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### Basic Math & Pre-Algebra For Dummies Cheat Sheet

With arithmetic a little understanding can go a long way toward helping master math. Some math concepts may seem complicated at first, but after you work with them for a little bit, you may wonder what

### Using Prime Factorizations

Every whole number greater than 1 has a prime factorization — that is, the list of prime numbers (including repeats) that equal that number when multiplied together. For example, here are the prime factorizations

### Introducing the Percent Circle

The percent circle is a simple visual aid that helps you make sense of percent problems so that you can solve them easily. The trick to using a percent circle is to write information into it. For example

### Using Probability to Calculate the Odds in the Game of Craps

Probability is the mathematics of deciding how likely an event is to occur. You can calculate the probability of an event by using the following formula:

### Simplifying and Factoring Expressions

In algebra, simplifying and factoring expressions are opposite processes. Simplifying an expression often means removing a pair of parentheses; factoring an expression

### 10 Math Concepts You Can't Ignore

Math itself is one big concept, and it's chock full of so many smaller mathematical concepts that no one person can possibly understand them all — even with a good dose of studying. Yet certain concepts

### How to Convert between Fractions and Repeating Decimals

To convert a fraction to a decimal, divide the numerator (top number) by the denominator (bottom number), using either calculator or pencil and paper. For example, here’s how to convert the fraction

### Making Sense of Weird Exponents

Exponents are a quick way to represent repeated multiplication. Raising a base number to the power of an exponentmeans multiplying the base by itself the number of times indicated by the exponent. For

### Solving Systems of Equations in Algebra

In most cases, an algebraic equation is solvable only when one value is unknown — that is, when the equation has only one variable. In rare cases, you can solve an equation with two or more variables because

### 10 Great Mathematicians

Mathematics is an ongoing journey of thousands of years and millions of minds. The list below is by no means complete, but here are ten great mathematicians whose work forever changed not only math but

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