Comments on: 10 Easy Arithmetic Tricks http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/ Ultimate Top 10 Lists - Listverse Sat, 21 Nov 2009 07:47:29 +0000 http://wordpress.com/ hourly 1 By: chery http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-227499 chery Thu, 19 Nov 2009 13:58:28 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-227499 thankyou..... this would help me to improve my maths and to do it in a faster ,simpler,easier way.. thankyou…..
this would help me to improve my maths and to do it in a faster ,simpler,easier way..

]]> By: chery http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-227497 chery Thu, 19 Nov 2009 13:56:46 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-227497 thankyou!this would help me to do maths in faster and easier way... thanks a lot! thankyou!this would help me to do maths in faster and easier way…
thanks a lot!

]]> By: bima http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-226570 bima Tue, 17 Nov 2009 17:37:48 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-226570 beautiful list! beautiful list!

]]> By: Ravi http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-224698 Ravi Thu, 12 Nov 2009 13:37:16 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-224698 @jaiveer (<a href='#comment-211342' rel="nofollow">222</a>): @Online Math Tutor (<a href='#comment-220842' rel="nofollow">242</a>): @Gewgaws (<a href='#comment-223216' rel="nofollow">244</a>): @jaiveer (222): @Online Math Tutor (242): @Gewgaws (244):

]]> By: Gewgaws http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-223216 Gewgaws Tue, 10 Nov 2009 13:08:34 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-223216 To add up the numbers 1 to x (any number) :- multiply x by (x + 1) and then half the result For example to add the numbers from 1 to 10 :- 10 x 11 = 110 110 / 2 = 55 (you can check this by doing 1+2+3+4+5+6+7+8+9+10 on a calculator or in your head) This works for any whole number To add up the numbers 1 to x (any number) :-

multiply x by (x + 1) and then half the result

For example to add the numbers from 1 to 10 :-

10 x 11 = 110
110 / 2 = 55 (you can check this by doing 1+2+3+4+5+6+7+8+9+10 on a calculator or in your head)

This works for any whole number

]]> By: siddhant http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-221980 siddhant Fri, 06 Nov 2009 16:03:44 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-221980 take a calendar.ask your friend to mark 9 numbers[in a 3*3grid] in a rectangle in the calendar.ask him/her to add 8 in the smallest number in the rectangle and multiply it by nine.write the total in a piece of paper.this is number a.now tell him to add the nine number.this is number b.now tell your freind to unfold the paper.he wiii be shocked! take a calendar.ask your friend to mark 9 numbers[in a 3*3grid] in a rectangle in the calendar.ask him/her to add 8 in the smallest number in the rectangle and multiply it by nine.write the total in a piece of paper.this is number a.now tell him to add the nine number.this is number b.now tell your freind to unfold the paper.he wiii be shocked!

]]> By: Online Math Tutor http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-220842 Online Math Tutor Tue, 03 Nov 2009 19:23:21 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-220842 Great Tips! I will share it with my students who take <a href="http://www.schooltrainer.com/online-tutoring/online-math-tutoring.html" rel="nofollow">online math tutoring</a> sessions from me. Thanks a lot! Great Tips! I will share it with my students who take online math tutoring sessions from me. Thanks a lot!

]]> By: Rondy http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-219741 Rondy Fri, 30 Oct 2009 22:23:57 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-219741 wow amazing thing! Ok going to Fishki.lt http://fishki.lt to relax after good mathematic break. Thanks very useful! wow amazing thing! Ok going to Fishki.lt http://fishki.lt to relax after good mathematic break. Thanks very useful!

]]> By: john http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-219049 john Wed, 28 Oct 2009 12:53:59 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-219049 i have a doubt in quick square can any one sort it out. above mention that: If you need to square a 2 digit number ending in 5, you can do so very easily with this trick. Mulitply the first digit by itself + 1, and put 25 on the end. That is all! 25 square(2) = (2x(2+1)) & 25 2 x 3 = 6 625 but what about 45 square 45 * 45 = (4*(4+1))&45 = (4*5)& 45 =2045 but answer is 2025 i have a doubt in quick square can any one sort it out.
above mention that:
If you need to square a 2 digit number ending in 5, you can do so very easily with this trick. Mulitply the first digit by itself + 1, and put 25 on the end. That is all!
25 square(2) = (2x(2+1)) & 25
2 x 3 = 6
625

but what about 45 square
45 * 45 = (4*(4+1))&45
= (4*5)& 45
=2045 but
answer is 2025

]]> By: biku sahoo http://listverse.com/2007/09/17/10-easy-arithmetic-tricks/#comment-219040 biku sahoo Wed, 28 Oct 2009 12:35:18 +0000 http://listverse.com/science/10-easy-arithmetic-tricks/#comment-219040 192*19= ? 192*19= ?

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