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How to do:  Lattice Multiplication Created by Lilian Patrick 2009
What is lattice multiplication and when would we use it? ,[object Object],[object Object]
Sounds great! How do we get started?
Let’s start with a 2-digit by 1-digit example… ,[object Object],[object Object],[object Object]
[object Object]
[object Object],4 2 9
[object Object],4 2 9 2 x 9   4 x 9
[object Object],4 2 9 1 8 3 6
[object Object],4 2 9 1 8 3 6
[object Object],4 2 9 1 8 3 6 8 + nothing =  8 6 + 1 =  7 3 + nothing =  3
[object Object],4 2 9 1 8 3 6 8 7 3 42 x 9 = 378
Now let’s try a 2-digit by 2-digit multiplication problem…  ,[object Object],[object Object],[object Object]
[object Object],And the numbers: Since they’re both 2-digits, it doesn’t matter which one goes on the top and which one goes to the right of the grid. 5 4 9 7
[object Object],5 4 7 4 x 9 4 x 7 5 x 9 5 x 7 5 4 9 7 3 6 2 8 4 5 3 5 9
[object Object],5 4 9 7 3 6 2 8 4 5 3 5 8 3 1 The 1 is carried from the previous diagonal:  5 + 2 + 6 = 13 The 3 goes at the bottom of that diagonal.  The 1 gets added to the next diagonal. 2 5 1 54 x 97 = 5,238
[object Object],1.)  26 x 4 = 2 6 4 2.)  31 x 62 = 3 1 6 2
See if you got the answers! ,[object Object],2 6 4 2 4 8 0 1 0 4 1 3 1 6 2 2.) 1 8 0 6 0 0 6 2 9 1 2 2 1 26 x 4 = 104 31 x 62 = 1,922
Now that you’ve learned lattice multiplication, you can practice with any numbers of your choice!  Good luck!

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Lattice Mult. V2

  • 1. How to do: Lattice Multiplication Created by Lilian Patrick 2009
  • 2.
  • 3. Sounds great! How do we get started?
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18. Now that you’ve learned lattice multiplication, you can practice with any numbers of your choice! Good luck!