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How to learn and teach Subtraction

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Are you still using the same subtraction methods you did when you were a second-grader?

There are lots of great ways to do subtraction, and just about all of them are easy. So why not learn a much faster, streamlined way to add? No calculator, no pencil or paper. Just pure subtraction.

Imagine subtracting long columns in your head, from left to right (instead of that lame way they taught you in school) faster than a calculator.,

You'll be able to figure your change as quickly as the register. Register clerks freak out when I use this.

It turns out that speed-subtraction is about the easiest Mojo skill to learn.

I'll put up more tips and links as I develop them for the web.

Subtraction Links

Great tips on how to jam with mental subtraction

Left-to-Right mental speed subtraction
They didn't teach this to you in school, and it's a shame! It's as easy as what they taught you, and much faster and more effective.
If you can do regular subtraction, it will take you about a minute to learn this method.
This is also the natural extention to learn after a child has learned on the abax.
Change for the Better
This is the definitive booklet for anyone who deals with money. (Could that be you?)
Using speed-subtraction you will be able to calculate you change almost instantly. Anyone who works at a register should be required to know everything in here. It will save them from embarrassing mistakes, and from getting ripped-off by scam artists.

Never be frustrated while making or getting change again!

Making change is a "lost skill." Don't be one of those people who get confused when making change.

Give you children an advantage in the employment market by improving their confidence in their calculating skills. (It won't hurt them in math class, either!) This is the first booklet in a series of how to deal with money in daily life.

The material in this booklet is easy to learn, and you'll learn some interesting things about making change that you've probably never thought about before.

The e-booklet is only $9.95, and is a tiny investment for a valuable skill.

You can order "Change for the Better" now.

Got a question or a story about subtraction?

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Homunculus

Hi,

My name is Brian Foley (a.k.a. "Professor Homunculus" at the mathmojo.com site).

I am not a "math guy" and never was. I don't care about the... more »

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