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Topic: Fast maths truly amazing<< 


For me this was new. I have NEVER been interested in maths. It's just NOT my subject at all. Yet when I found Fast Maths on YouTube, I was transformed. My wife would just NOT believe it....she would fire a maths question at me ... and within seconds I had the answer. This is just NOT me. She did not know how I came up with the answer sooooo quickly. It's such fun. A great intertainer... 18 x15 = 93 x 97 = 143539 x 11 = 73 x 57 = ????? easy. good "after dinner" entertainment 


18 x 15 = 9 x 30 = 270 93 x 97 = (95  2) x (95 + 2) = 95²  2² = 9025 (see the trick on another thread) 4 = 9021 143539 x 11 = 1435390 + 143539 = 1578929 (adding starts from the last digit) 73 x 57 = (65 + 8) x (65  8) = 65²  64 = 4225  64 = 4161 Not from youtube (as I am sitting here without possibility to see it), but easy caluclations. Angelo 