Presentation Transcript
Lattice Method :Lattice Method
When you see… :When you see… 28
X74
Do you think… :Do you think… I don’t get it! This is hard! Uh-oh!
Then, try this! :Then, try this!
You have an equation to solve. :You have an equation to solve. 28 X 74 =
28 X 74 = :28 X 74 = Draw a box
Split it into fourths.
Draw diagonals.
Write the factors on the top & right sides of the box. :Write the factors on the top & right sides of the box. 7 4 2 8
Multiply to complete the top row. :Multiply to complete the top row. 7 X 8 = 56 2 8 7
4 7 X 2 = 14 5
6 1
4
Multiply to complete the bottom row. :Multiply to complete the bottom row. 4 X 8 = 32 2 8 7
4 3
2 0
8 4 X 2 = 8
Add the diagonals. :Add the diagonals. 2 8 7
4 2 0 7 2 1 1
Your product (answer) is the numbers on the bottom & left sides. :Your product (answer) is the numbers on the bottom & left sides. 2 8 7
4 2 0 7 2
28 X 74 = 2,072 :28 X 74 = 2,072
Slide 13:Now I get it!
Now you try one! :Now you try one! 3 9 7
3
Did you get it? :Did you get it?
Slide 16:3 9 7
3 7 4 8 2 And the answer is…
Way to go! :Way to go!