(This page should be friendly to most colourblind viewers)
This is one of the biggest reasons people say, "I don't want to do math, it's too much work." or "I'm terrible at arithmetic."
We all find ourselves cowering behind the mighty 5 saying, "2.4? Okay, that's close enough, let's round it to 2.5." Contrast this to the dozenal multiplication chart, we find many patterns and less rules to remember.
We all find ourselves cowering behind the mighty 5 saying, "2.4? Okay, that's close enough, let's round it to 2.5." Contrast this to the dozenal multiplication chart, we find many patterns and less rules to remember.
Decimal

But first, let's take a look at our decimal multiplication table:

The squares show the zero enders. This reflects a healthy and easy number system. Hmm...
Notice the big open areas without zero enders in the 4 corners of the grid. All of those numbers, you have to memorize in your times tables.
Notice the big open areas without zero enders in the 4 corners of the grid. All of those numbers, you have to memorize in your times tables.
Now, let's take a look at the dozenal multiplication table:

Dozenal

With all these zero enders, the sequences are straight forward. You can feel confident in your multiplication that takes just seconds to double check.
You can test yourself, "8 times 9. Oh, 8, 14, 20... 28, 34, 40... 48, 54, 60. Yes, 60."
You can test yourself, "8 times 9. Oh, 8, 14, 20... 28, 34, 40... 48, 54, 60. Yes, 60."
Those 5's and 7's are a pain sure, but when you can take a number like 64, 49, or 36 and multiply that with ease, you'll wonder why we still use the decimal system.
* read 7's even trick is below. 
Multiplication
Tips and Tricks
Digit Behavior
3's and 9's (Easy)
4's and 8's (Easy)
6's (Easiest)
7 evens (Easy if the multiple is an even number)
Ƹ's (Same as in decimal)
5 evens (The hard one)
