Math Help
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# Math Help

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## What are Real Numbers? Rational, Irrational, Natural, and Integer Numbers - The Numerist

What are Real Numbers?  When you are first learning to do math with numbers, you never think about what “kinds” of numbers you use.  You just add 2 plus 2, or subtract 10 from 20, and later on begin to multiply (-3) times (-5) (refer to Multiplying Integers here) and other, more complicated functions.  What …
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## What is Scientific Notation?

So, just what is Scientific Notation? It is probably one of the first topics you will learn in early physics courses. As such, it is crucial that you understand it and are able to use it. Honestly, without scientific notation, physics problems get INCREDIBLY difficult, and if you don’t get it at first, you should …
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## Google's Free Online Calculator - The Numerist

It’s probably happened to you before: you go to do your math homework and you suddenly realize that you don’t have your calculator handy. What if you have a test tomorrow and you absolutely need your calculator right now to help you study? If you have your smartphone or computer with you, you can easily …
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## Which Measure of Central Tendency to Use? Mode, Mean, or Median? - The Numerist

Are you having troubles choosing which measure of central tendency to use for your data set? Check out this post for some tips.
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## The Theorem of Pythagoras Explained - The Numerist

The Theorem of Pythagoras is a specific case of the Cosine Law that applies specifically to right angle triangles. With it, and given any two sides of a right angle triangle, you can find the third side. Then having solved all the sides of the triangle, you can use the standard trig identities (Sine, Cosine, [...]
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## Trigonometry - Cosine Law - The Numerist

The Cosine Law works similarly to the Sine Law that I have already discussed. Actually, it may seem somewhat familiar to you. While the Cosine Law can be used on any triangle, the Pythagorean Theorem is a specific case of the Cosine Law which strictly applies to right angle triangles. It’s a bit more of [...]
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## Monomials and Polynomials Explained - The Numerist

Learn more about what monomials and polynomials are, and some rules to keep in mind with working with them
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## The Difference Between Precision and Accuracy

What is the difference between PRECISION and ACCURACY? Upon first glance, many students would say that the two terms mean the same thing. In normal day-to-day usage, you would talk about how precise this is, or how accurate that is, and in both cases you would be comparing “how close” some thing is to the …
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## Multiplying Integers – Why Multiplying Two Negatives is a Positive

I have recently been asked to explain why two negative numbers multiply together to product a positive number. This can be a difficult concept to grasp at first, but I would like to try to simplify an explanation. First, I would like to recommend and give credit to David’s website, at Practic-All. In particular, he …
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## What are Real Numbers? Rational, Irrational, Natural, and Integer Numbers - The Numerist

What are Real Numbers?  When you are first learning to do math with numbers, you never think about what “kinds” of numbers you use.  You just add 2 plus 2, or subtract 10 from 20, and later on begin to multiply (-3) times (-5) (refer to Multiplying Integers here) and other, more complicated functions.  What [...]
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## Trigonometry - Sine Law - The Numerist

Using the sine law is a great way of finding missing sides and angles when you do not have a right angle triangle. Here I explain the law with examples.
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## What are Significant Figures? - The Numerist

Learn what are significant figures, and how to count significant figures by following this simple set of rules.
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## How to Calculate the Area of a Triangle - The Numerist

There are several different methods that can be used to help you to calculate the area of a triangle. In this post, I will teach you several of them.
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