# Basic Math & Pre-Algebra

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### Differential Equations Workbook For Dummies Cheat Sheet

Once you’ve figured out the type of differential equation you’re dealing with, you can move on to solving the problem by using the method of undetermined coefficients or the power series method. If a stubborn

### Calculating GPA

Nowadays, grade point averages are a big deal, especially for college-bound students and their anxious parents. GPA is easy to calculate if you understand that it's simply an average. To determine an average

### Estimating Taxes and Discounts When Shopping

When you go shopping, you're often faced with discounts and sales offers that change the price of an item. In addition, many states in the United States charge sales tax, and if you're shopping abroad,

### Calculating Area and Volume for Household Projects

Many household projects require that you be able to calculate area or volume. Whether you're painting your kid's room, mulching your flowerbed for the winter, planting grass seed in the spring, or tackling

### Using Your Body to Estimate Length

Many real-life math problems don't require exact solutions or precise calculations. When you need an approximate idea of length, you have a handy-dandy

### Calculating Speed, Time, and Distance

If you drive a car or have ever flown in an airplane, you've probably noticed that time, speed, and distance are related. Here's the basic formula for distance

### Nine Ways to Make Any Exam Easier

Exams, especially those covering basic maths, can be stressful and frustrating, and not many people enjoy doing them. But jumping through the hoops of an exam doesn’t have to be hard. If you can reach

### Ten Pitfalls to Avoid on Basic Maths Tests

When you’re under pressure in a maths test, you’re bound to make some mistakes. But some mistakes are avoidable when you know how; there are also some mistakes you can learn to check for and put right.

### Ten Tricks for Remembering Your Number Facts

Learn your number facts efficiently and with the minimum of fuss. The quicker you can command total mastery of your number facts, the quicker you can stop having to learn them, and the more time you can

Dozens of good websites offer games to help you learn maths facts and techniques. Some are fun, others serious, and others somewhere in between. Here are some favourites:

### How to Solve Probability Problems with the Number Line

Marking where you think a probability lies on a number line is an obvious way to deal with probabilities on a basic maths test. The left end of the line represents ‘impossible’ and the right end represents

### How to Estimate Probability with Experiments

The most reliable way to estimate the probability of an event happening is to do an experiment. You need to know about two kinds of probability experiment. In the first type, you repeat things under pretty

### How to Read and Work with Probability Trees

Teachers around the world use probability trees. Probability trees are quite versatile if you use them properly. The idea of a probability tree is to start on the left with ‘the whole thing’ or one. Every

### How to Read and Work with Probability Tables

A probability table is a way of representing probabilities. The following probability table looks at the events ‘throwing a head on a fair 50p piece’ and ‘throwing a head on a fair £1 coin.’

### How to Read and Work with Probability Squares

Probability squares are a really good option when you have two independent events – two things that don’t affect each other. You may like probability squares if you’re more a ‘shapes person’ than a ‘numbers

### The Three Types of Average – Median, Mode and Mean

We use three different types of average in maths: the mean, the mode and the median, each of which describes a different ‘normal’ value. The mean is what you get if you share everything equally, the mode

### What You Need to Know About Ranges

The range of a set of values is a really useful description of a list to show how spread out the values are – or the difference between the biggest and the smallest values.

### How to Draw Bar Charts on a Computer

To draw a bar chart – in fact, any kind of chart – in a spreadsheet, you need to do two things: enter your data into the program, and tell the program to draw a graph.

### How to Draw Pie Charts on a Computer

Drawing a pie chart on the computer is a fantastic experience, at least compared with doing it by hand. It takes seconds, and you don’t have to remember how to use a protractor or worry about getting your

### How to Draw Line Graphs on a Computer

The easiest way to draw a line graph using a computer is to use a spreadsheet program such as Microsoft Excel or OpenOffice Calc, which is free.

### The Basics of Bar Charts

A bar chart looks a little like a picture of a skyline, consisting of different heights of ‘tower’ lined up side–by-side. The heights of the towers represent the relative sizes of the categories they represent

### The Basics of Pie Charts

A pie chart looks – you’ve guessed it – a bit like a pie. The chart is a circle with various-sized slices ‘cut out’ from the middle to the edge. The size of the slices shows the relative size of the categories

### The Basics of Line Graphs

A line graph shows how a value changes, usually over time. Most line graphs look like a jagged line going across the page. How high the line is above a time marked on the axis tells you how high the value

### How the Table of Joy Works for Basic Maths

The Table of Joy is an incredibly useful method for working out any kind of problem involving proportions – that is to say, if you double one of the numbers, the other automatically doubles. For example

### How to Apply the Table of Joy to Ratio Questions

You can use the Table of Joy to solve typical ratio questions on most numeracy tests. A ratio describes how many times bigger one share of something is than another share.