Many people know about the 9's trick with your hands; however, I've never seen a good trick for the 6s, 7s, or 8s (other than for 6 and 8 you can half the factor and then double the product: instead of 6x4 you can do 3x4 and double it).
This summer I stumbled upon this British man who came up with a trick to figuring out the products of factors 6x6 to 10x10 using his hands! It's a little tricky, but once you get the hang of it you'll be happy you practiced! This doesn't mean you shouldn't still memorize your facts (it's much faster to know them then to do this trick), but it's a good way to learn your facts!
Please get permission to go to this YouTube video before clicking on it: 6x6 to 10x10 Hand Trick - YouTube
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