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Lattice Multiplication with Decimals Step by Step Guide

Learn how to multiply decimals using the lattice method with clear instructions and examples in an easy-to-follow format. Practice multiplying 3.42 by 6.9 in a step-by-step manner, including placing decimal points correctly and adding the diagonals to get the final answer of 23.598. This guide is perfect for quick decimal multiplication refreshers!

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Lattice Multiplication with Decimals Step by Step Guide

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  1. Lattice Multiplicationwith Decimals Step-by-Step

  2. 3.42 * 6.9 = Ok! I know how to do Lattice, but I don’t remember how to multiply with decimals!!!

  3. 3.42 * 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. 4 3 2 6 9

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

  5. 3.42 * 6.9 . Multiply 6 * 2 and place the answer in the grid where the lines meet. 4 3 2 1 6 . 2 9

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

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

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

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

  10. 3.42 * 6.9 . Multiply 3 * 9 and place the answer in the grid where the lines meet. 4 3 2 1 2 1 . 6 4 8 2 2 3 1 9 7 6 8

  11. 3.42 * 6.9 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. . 4 3 2 1 2 1 . 6 4 8 2 2 3 1 9 7 6 8 8

  12. 3.42 * 6.9 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. . 4 3 2 1 2 1 . 6 4 8 2 2 3 1 9 7 6 8 9 8

  13. 3.42 * 6.9 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. . 4 3 2 1 2 1 +1 . 6 4 8 2 2 3 1 9 7 6 8 5 9 8

  14. 3.42 * 6.9 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. . 4 3 2 1 2 1 +1 +1 . 6 4 8 2 2 3 1 9 3 7 6 8 5 9 8

  15. 3.42 * 6.9 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. . 4 3 2 1 2 1 +1 +1 2 . 6 4 8 2 2 3 1 9 3 7 6 8 5 9 8

  16. 3.42 * 6.9 Now you need to place the decimal. Follow the lines until they meet. . 4 3 2 1 2 1 +1 +1 2 . 6 4 8 2 2 3 1 9 3 7 6 8 5 9 8

  17. 3.42 * 6.9 Now drop on the diagonal to place the decimal. . 4 3 2 1 2 1 +1 +1 2 . 6 4 8 2 2 3 1 9 3 7 6 8 . 5 9 8

  18. 3.42 * 6.9 Your answer is 23.598!! . 4 3 2 1 2 1 +1 +1 2 . 6 4 8 2 2 3 1 9 3 7 6 8 . 5 9 8

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

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