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Decimal

This is one of the biggest reasons people say, "Oh, I hate math," "Math is too hard for me," "Yeah, I don't do math... sorry"
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. But first, let's take a look at our decimal multiplication table:
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. But first, let's take a look at our decimal multiplication table:
Dozenal
Let's take a look at the dozenal multiplication table:

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.
* 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 multiple is even number)
Ƹ's (Same as in decimal)
5 evens (The hard one)
