Decimal lattice multiplication

Lattice Multiplication with Decimals Step-by-Step

3.42 * 6.9 = Ok! I know how to do Lattice, but I don’t remember how to multiply with decimals!!!

3.42 * 6.9 3 4 2 6 9 Make a grid the exact size of your problem. A 2 digit number times a 3 digit number gets a 2 x 3 grid. Draw a diagonal line in each box.

3.42 * 6.9 3 4 2 6 9 Place the decimal point above/beside the line in the grid. . .

3.42 * 6.9 3 4 2 6 9 1 2 Multiply 6 * 2 and place the answer in the grid where the lines meet. . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 Multiply 4 * 6 and place the answer in the grid where the lines meet. . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 Multiply 3 * 6 and place the answer in the grid where the lines meet. Use a zero as a place holder. . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Multiply 2 * 9 and place the answer in the grid where the lines meet. . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Multiply 4 * 9 and place the answer in the grid where the lines meet. 6 3 . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Multiply 3 * 9 and place the answer in the grid where the lines meet. 6 3 7 2 . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer. 6 3 7 2 8 . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer. 6 3 7 2 8 9 . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer. 6 3 7 2 8 9 +1 5 . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer. 6 3 7 2 8 9 +1 5 3 . +1 .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer. 6 3 7 2 8 9 5 3 . +1 +1 2 .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Now you need to place the decimal. Follow the lines until they meet. 6 3 7 2 8 9 5 3 . +1 +1 2 .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Now drop on the diagonal to place the decimal. 6 3 7 2 8 9 5 3 . +1 +1 2 . .

3.42 * 6.9 3 4 2 6 9 1 2 4 2 8 1 8 1 Your answer is 23.598!! 6 3 7 2 8 9 5 3 . +1 +1 2 . .

3.42 * 6.9 = 23.598 That is Soooo Cool!!! Thanks!

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Decimal lattice multiplication

by Kevin Cummins on Apr 26, 2011

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Decimal lattice multiplication — Presentation Transcript