rapid multiplication with the last digit 5 (the magic number 5)

I've been wanting to actually posting this article, but since I am human I am also forgetful and still too insecure with my ability that not how this, so delayed and now my new posts. and there is another reason that makes me hesitate for posting this article. I was afraid spelled plagiarism, and after I check repeatedly with hunting to other blogs, it turns out eh was no one posting on the last digit multiplication quickly 5.

This rapid multiplication can be done outside of the head and can be very fast compared to known results we compute with a calculator. but it's done when you really master the basic calculation is multiplication, addition, subtraction, division head outside. do not believe it ..... you can prove to me ..... but if I again concentrated yea ... hahahahahaha. we begin rapid multiplication tutorial course:

rapid multiplication twin figures

example

45 x 45 = .......?

if we count use calculator certainly answer 2025 (justified, must be true, if one is broken calculator times)

if we use the count

45
45
___x_
225
180
_____ + _
2025

fast way:

   1. to the results of future numbers you multiply his numbers are 4 x 4 = 16, then added with the next number so 16 + 4 = 20
   2. to the results of 2 digits behind you multiply 5 x 5 = 25

so the overall result is 2025, you try to test with your friends using the calculator .......... who is quickly counting ......

rapid multiplication of the two figures on the even or both odd

example:

85 x 45 = .......?

use a calculator if we count 3825 as well as the answer for sure if we count street use.

Fast way:

   1. for his numbers you multiply 4 x 8 = 32 then we add to the sum of the numbers are divided by 2 (4 + 8: 2 = 6) so the result is 32 + 6 = 38
   2. to multiply the numbers behind our 5 x 5 = 25

so the overall results similar to 3825, again in the same test ok your friend who is the fastest calculated?. For odd numbers both front aja kok way as above.

Rapid multiplication of his odd and even numbers

example:

65 x 95 = .......?

outcomes of calculator use path is ato 6175

well this is rather complicated way so the attention is really yes

   1. for the future we multiply the numbers first is 9 x 6 = 54 then the results are added to the sum of the numbers divided by 2 is 9 + 6: 2 = 15: 2 = 7.5 so we take only the figure MoU was signed on 7, so 54 + 7 = 61
   2.  for figure behind him because his numbers odd even then the result is always 75, why ... actually my original discovery anyway ........ so if according to my research the number 75 comes from multiplying 5 x 5 + 50 (rest of the results from 0.5 The first step is equated with 50) ... it seems to me yea .... i do not know by mathematical scientists ... hehehehhehe

so the end result is 6175, how jeniuskan me (heheheh narcissistic mode on)

so first post I do not how this is possible can you use to test public servants, labor admission test, test UMPTN, or to show off with my friends ........ Myspace-multiplication multiplication if there are others that I can quickly share will I postingkan quickly for you-all. That's all and thank you.

Sources Library: Original discoveries that have been stored on the SD when I follow the race Mathematics subjects be covered. So if anyone would like Copas please aja origin are set out in the original source yea ..... not free of charge ..... :) peace