Mathhiker Math Tutorials » (6) Math Tricks (Saturdays)

Saturday, December 5, 2009 – Using Factoring to Cube Any Number

minkusbc — Sat, 05 Dec 2009 21:16:38 +0000

Using the factoring formula for the difference of cubes leads to a mental mathematics trick to cube any number. Please click on the file name to see the pdf file.

Using Factoring to Cube Any Number

Saturday, November 28, 2009 – How to Multiply Two Numbers in the 20’s, 30’s, etc.

minkusbc — Sun, 29 Nov 2009 18:47:09 +0000

This extends the idea that we looked at two weeks ago on November 14th, and, of course, includes more proofs. Please click on the file name to see the pdf file.

How to Multiply Two Numbers in the 20’s, 30’s, etc.

Saturday, November 21, 2009 – How to Square a Number Ending in “1″

minkusbc — Sat, 21 Nov 2009 19:37:20 +0000

Here is a neat little squaring trick, and of course why it works. Please click on the file name to see the pdf file.

How to Square a Number Ending in a “1″

Saturday, November 14, 2009 – How to Multiply Two Numbers in the Teens

minkusbc — Mon, 16 Nov 2009 01:37:36 +0000

Here is a neat little trick, and of course, why it works. Please click on the file name to see the pdf file.

How to Multiply Two Numbers in the Teens

Saturday, November 7, 2009 – How to Memorize Phone Numbers (or any number)

minkusbc — Sat, 07 Nov 2009 23:36:18 +0000

Using a technique that I learned 35 years ago, I can still remember phone numbers from that time. Please click on the file name to see the pdf file.

How to Memorize Phone Numbers (or any number)

Saturday, October 24, 2009 – Using Your Fingers to Do Math

minkusbc — Sat, 24 Oct 2009 17:31:53 +0000

The following introduces a new twist on an old trick. Many of you may have seen how to use your fingers to multiply by 9, however, today we extend it further. Please click on the file name to see the pdf file.

Using Your Fingers to Do Some Math

Saturday, October 17, 2009 – Another, “I Can Read Your Mind Trick”

minkusbc — Sat, 17 Oct 2009 18:43:56 +0000

Using a simple property of numbers, we look at another “mind reading” mathematical trick. And, of course, I explain why it works (for about 98% of the people). Please click on the file name below to see the pdf file.

Another, “I Can Read Your Mind” Trick

Saturday, October 10, 2009 – The Magic of 1089.

minkusbc — Fri, 09 Oct 2009 23:00:59 +0000

Here is a neat little trick that involves the number 1089. Of course, along with how to do the trick, I also show you the proof of why it works. There once was a saying, “If you know HOW to do something, you will always have a job, but you will be working for the person who knows WHY it works!” Please click on the file name below to see the pdf file.

The Magic of 1089

Saturday, October 3, 2009 – A Few Calculator Tricks

minkusbc — Sat, 03 Oct 2009 18:38:56 +0000

Fooling around with a calculator sometime yields surprising answers. Here are a few for you to try. Please click on the file name to see the pdf file.

Some Math Tricks On Calculators

Saturday, September 26, 2009 – Another Neat “Math” Card Trick (and how it works)

minkusbc — Sat, 26 Sep 2009 18:40:01 +0000

I saw this trick done on the internet, and the person doing the trick did not know how it works. Consequently, I leaped into the breach and have produced the solution. Please click on the file name below to see the pdf file.

The “Three Left” Card Trick