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# Decimal lattice multiplication

## on Jun 20, 2012

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## Decimal lattice multiplicationPresentation Transcript

• 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 * 6.9Make 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 4 2 6 9
• 3.42 * 6.9Place the decimal point above/beside the line in the grid. 3 . 4 2 . 6 9
• 3.42 * 6.9Multiply 6 * 2 and place the answer in the grid where the lines meet. 3 . 4 2 1 6 2 . 9
• 3.42 * 6.9Multiply 4 * 6 and place the answer in the grid where the lines meet. 3 . 4 2 2 1 4 2 6 . 9
• 3.42 * 6.9Multiply 3 * 6 and place the answer in the grid where the lines meet. Use a zero . as a place holder. 3 4 2 1 2 1 8 4 2 6 . 9
• 3.42 * 6.9Multiply 2 * 9 and place the answer in the grid where the lines meet. 3 . 4 2 1 2 1 8 4 2 6 . 1 9 8
• 3.42 * 6.9Multiply 4 * 9 and place the answer in the grid where the lines meet. 3 . 4 2 1 2 1 8 2 6 4 . 3 1 9 6 8
• 3.42 * 6.9Multiply 3 * 9 and place the answer in the grid where the lines meet. 3 . 4 2 1 2 1 2 6 8 4 . 2 3 1 9 7 6 8
• 3.42 * 6.9Now 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. 3 4 2 1 2 1 2 6 8 4 . 2 3 1 9 7 6 8 8
• 3.42 * 6.9Now 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. 3 4 2 1 2 1 2 6 8 4 . 2 3 1 9 7 6 8 9 8
• 3.42 * 6.9Now 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. 3 4 2 1 2 1 +1 2 6 8 4 . 2 3 1 9 7 6 8 5 9 8
• 3.42 * 6.9Now 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. 3 4 2 1 2 1 +1 +1 2 6 8 4 . 2 3 1 93 7 6 8 5 9 8
• 3.42 * 6.9Now 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. 3 4 2 1 2 1 +1 +12 2 6 8 4 . 2 3 1 93 7 6 8 5 9 8
• 3.42 * 6.9 Now you need to place the decimal. Follow the lines until they meet. 3 . 4 2 1 2 1 +1 +12 2 6 8 4 . 2 3 1 93 7 6 8 5 9 8
• 3.42 * 6.9 Now drop on the diagonal to place the decimal. 3 . 4 2 1 2 1 +1 +12 8 2 6 4 . 2 3 1 93 7 6 8. 5 9 8
• 3.42 * 6.9 Your answer is 23.598!! 3 . 4 2 1 2 1 +1 +12 8 2 6 4 . 2 3 1 93 7 6 8. 5 9 8
• That is Soooo Cool!!! Thanks!3.42 * 6.9 =23.598