I often use these tricks to prove myself good in math’s although I am a very bad in mathematics. You can challenge your friends, that you are better than a normal calculator. How? just follow the process
Tell your friend to calculate 111111111 x 111111111 with the help of his calculator. ;)
Your friend will find the result too large to be calculated by a calculator. Now you can surprise him by giving the answer. The answer will be 12345678987654321
How can you calculate: When you multiply by the same number of 1's in both side then just count the 1's in 1 side. For example, in the multiplication 111111111x111111111 we have 9, 1's in each side. So type or write from 1 to 9 (123456789) . After typing 9 then start writing from the reverse (87654321). So in aggregate the answer will be 12345678987654321 .
IN THE SAME WAY ,
11 x 11 = 121
111 x 111 = 12321
1111 x 1111= 1234321
11111 x 11111 = 123454321
111111 x 111111= 12345654321
1111111 x 1111111= 1234567654321
11111111 x 11111111= 123456787654321
111111111 x 111111111= 12345678987654321
I hope you will understand the tricks from the example ;)
Now the second tricks called "without 8"
Take a number of digits from 1 to 9 except the digit 8. So the number is 12345679
Now if you multiply the number by 9 the answer will be 111111111 .
Again if you multiply the number by 9x2 (18) the answer will be 222222222
again, if you multiply the number by 9x3 (27) the answer will be 333333333
The whole example :
12345679 x 9 = 111111111
12345679 x 18 = 222222222
12345679 x 27 = 333333333
12345679 x 36 = 444444444
12345679 x 45 = 555555555
12345679 x 54 = 666666666
12345679 x 63 = 777777777
12345679 x 72 = 888888888
12345679 x 81 = 999999999
I hope you will enjoy the trick, remember math is fun when you know how to play with it ;) Thank you for visiting http://bnjho.blogspot.in
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