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Two-Digit Multiplication Mathmagic



m48ortalM48ortal on 02/04/2009

TwoDigitMultiplicationMathmagic Photo 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 two-digit 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.
10 Questions




Rating:  (8.18/9)
Difficulty:  Easy
Taken: 82 times

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Quiz Leaderboard
Player: Level: % Correct: Time to Complete:
1
Idaman 79100.00%    52.45 seconds    
2
Beehive 45100.00%    52.61 seconds    
3
Kevingarnett 65100.00%    55.52 seconds    
4
Pixie1208 16100.00%    67.35 seconds    
5
Dlbalch 5100.00%    69.03 seconds    
6
Uabaseball1119 14100.00%    71.78 seconds    
7
Gilgamesh10 62100.00%    71.85 seconds    
8
Daveguth 254100.00%    75.22 seconds    
9
Pragadeesh 2100.00%    76.19 seconds    
10
Kasba22 203100.00%    76.36 seconds    



Comments (10)
saiganesh
Saiganesh  (Level: 3.2)
Fri, 19th Mar '10 6:16 AM

Hey almost a few seconds was gone on my slow com


mcmahon
Mcmahon  (Level: 39.6)
Sat, 13th Mar '10 5:38 AM

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! Lol


mcmahon
Mcmahon  (Level: 39.6)
Sat, 13th Mar '10 5:38 AM

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


mcmahon
Mcmahon  (Level: 39.6)
Sat, 13th Mar '10 5:38 AM

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


haley09
Haley09  (Level: 2.1)
Fri, 20th Nov '09 6:00 PM

this ouiz was alright even though i failed








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