tag:blogger.com,1999:blog-2207789741693789296.post1017781179451861210..comments2024-03-28T09:23:46.097-04:00Comments on Cool Math Stuff: Memorizing Times Tables Through Twenty – Without Memorizing Anything!!!Ethan Brownhttp://www.blogger.com/profile/09611695185154134251noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-2207789741693789296.post-92056367927319745332013-02-24T23:49:55.214-05:002013-02-24T23:49:55.214-05:00Amazing method. It really works!
For kids who need...Amazing method. It really works!<br />For kids who need to learn the times table I want to share a website<br />http://mathskillbuilder.org/memorize_multiplication_table.html<br />It really help memorize the table faster and better than flashcardsAnonymoushttps://www.blogger.com/profile/03428019287136523969noreply@blogger.comtag:blogger.com,1999:blog-2207789741693789296.post-61227099428481480162011-06-21T21:10:53.718-04:002011-06-21T21:10:53.718-04:00I should have worded it differently, but the simpl...I should have worded it differently, but the simplified version I explained doesn't exactly work for twenty. This is a take on "The Close-Together Method," which is a Vedic system for multiplication. Anyways, the exact formula is not just using the last digit, but using the distance away from the number you multiplied by. Here, it is the distance away from ten because by tacking on a zero (the simplified way to explain it), you are multiplying the number by ten. That means at the end, you must find the product of the distance those two numbers are away from ten and not simply their last digit (which works for every number in the teens). In the case of 20 x 18 as you mentioned, you would multiply 8 x 10 instead of 8 x 0 in order to get the correct answer. There, 280 + 80 = 360, which is the correct answer to 20 x 18. Soon (probably around August), I am going to post on how this works, which will help you understand how to solve that sort of a problem.Ethan Brownhttps://www.blogger.com/profile/09611695185154134251noreply@blogger.comtag:blogger.com,1999:blog-2207789741693789296.post-37076265319001446252011-06-21T19:51:16.392-04:002011-06-21T19:51:16.392-04:00This works well until you come to the number 20. S...This works well until you come to the number 20. So 20 18 for example is 360. But if you add 20+8 and add a zero you get 280. If you multiply 8x0 you get zero, which makes you short by 80. How do you resolve this?<br /><br />Jack BrownJack Brownhttps://www.blogger.com/profile/17496582313377928454noreply@blogger.com