Alright, you might not win friends with this, but the more you can do arithmetic in your head... well... okay, you can't influence people with it either. Regardless, it's handy to know and helps with multiplication.
Yesterday I posted a couple of videos about factoring numbers into primes. Now it's time to put those to work.
How about a rather simple one to get us started:
Here's one that's a little more challenging. The key is that you can combine the bits to something you're more comfortable doing. I don't like multiplying nines, so I avoid those.
Can you use this? Why or why not? Ha ha, just kidding - no essay questions here! - but if you do find a use for this, or if this annoys you, let me know in the comments.
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