I have seen lots of books and videos that claim to teach you how to do math in your head. does this stuff really work ? can you recomend a good book or video ? thanks
Edited by Jim Pesmark, 09 December 2016 - 05:26 AM.
Posted 09 December 2016 - 05:25 AM
I have seen lots of books and videos that claim to teach you how to do math in your head. does this stuff really work ? can you recomend a good book or video ? thanks
Edited by Jim Pesmark, 09 December 2016 - 05:26 AM.
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