Add Yahoo as a preferred source to see more of our stories on Google. A TikTok video of a novel, ancient multiplication method has gone viral. While the user, jesslouisec, calls the method Japanese ...

What are you like at multiplications? Chances are if you're a mere mortal 2, 5s and 10s won't seem too taxing. But when it comes to figuring out what 42x21 is, you may wish somebody had shown you the ...