TwoDigit Multiplication Mathmagic
M48ortal on 02/04/2009
READ THIS CAREFULLY  Here's a shortcut that you can use to amaze your friends and family, and maybe even your teacher. You can multiply 2 twodigit numbers quickly if they meet two simple conditions: 1.) The ones places add up to 10, and 2.) the tens places are equal. For our example, we will use 68 X 62. These numbers are between 60 and 70 (in red on our diagram). Step 1: Multiply the tens digit (6) times the next higher number (7). This gives you the thousands and hundreds places of your answer (42). Step 2: Multiply the ones places (8 X 2). This gives you the tens and ones places of your answer (16). So 68 X 62 = 4216. Another quick one? OK, 29 X 21: I get 2 X 3 = 06 and 9 X 1 = 09, so my answer is 609. We can drop the 0 from in front of 6, but have to keep the 0 in front of 9, since it will be a placeholder. Got it? Now practice on these ten problems so you can be a Mathmagician! Drop me a comment if you want an algebra explanation.

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1  Idaman  79  100.00%  52.45 seconds 
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3  Kevingarnett  65  100.00%  55.52 seconds 
4  Pixie1208  16  100.00%  67.35 seconds 
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6  Dlbalch  5  100.00%  69.03 seconds 
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9  Daveguth  269  100.00%  75.22 seconds 
10  Pragadeesh  2  100.00%  76.19 seconds 
Comments (10)
Saiganesh (Level: 3.2)
Fri, 19th Mar '10 6:16 AM
Hey almost a few seconds was gone on my slow com
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I am great.What was that when you said be careful I got It right I never get anything wrong infact I have not got 1 question wrong on spoofus since I joined infact I got all my triva questions right aswell.Anything you want to know just ask me! Lop
I am great.What was that when you said be careful I got It right I never get anything wrong infact I have not got 1 question wrong on spoofus since I joined infact I got all my triva questions right aswell.Anything you want to know just ask me! Lop
this ouiz was alright even though i failed