Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20110109 09:03:59
Square any two digit number in your mind!Here is something interesting that I have been using to amaze my 8th graders~! #2 20110109 09:16:57
Re: Square any two digit number in your mind!Hi; Now all you have to do for 49^2 is a = 50 and b = 1 50^2  2(50)(1) + 1 2500  100 +1 = 2401 In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #3 20110109 11:18:35
Re: Square any two digit number in your mind!aha! very cool... i like it a lot! That'll save me a few seconds! Thanks for the other side of the box! #4 20110109 15:49:46
Re: Square any two digit number in your mind!Hi 4DLiVing; In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #5 20110110 02:34:20
Re: Square any two digit number in your mind!84 * 76 #6 20110110 03:24:32
Re: Square any two digit number in your mind!Not really computers make our life easier by allowing us to concentrate on the important things in life like eating. In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #7 20110114 01:58:41
Re: Square any two digit number in your mind! . . . . . . . . . . . . . . . . 