## Lattice Method of Multiplication

#### Aligned To Common Core Standard:

**Grade 4 Operations** - 4.NBT.B.5

What is the Lattice Method of Multiplication? Do you find long multiplication, boring and tiring? Well, there's no doubt that sometimes long multiplication takes forever. The good news is mathematics has an alternate for almost every concept. There are many other ways you can multiply with two- or three-digit numbers without using the long multiplication method. One such method is the lattice method. The lattice method gives you an alternative way to multiply more than one digits. The method uses a grid with diagonally written numbers that make a crisscross pattern. Hence it is called a lattice method. If you look around you will find out many crisscrosses or lattice patterns in your daily life, such as your grandma's delicious blueberry pie? This method of multiplication has been around for ages, probably since the Middle Ages, or even before your parents were born into this world. This method helps students in improving their organizational skills; it breaks down the process of long multiplication into smaller steps. At first, it might seem like a complicated task, but you'll learn to do it with time. These worksheets and lessons show students an easier method to use for greater success when you are multiplying very large numbers.

### Printable Worksheets And Lessons

- Lattice Method Step-by-Step Lesson- We show you how to use this approach to simplify your products. It just might help a great deal.
- Guided Lesson - Two problems with a empty lattice matrices for you to use.
- Guided Lesson Explanation - I made a detailed visual key for these. I think it will make it easy for students to do by themselves.
- 2x1 Practice Sheet 1 - 10 problems spread over 2 pages.
- 2 x 1 Practice Worksheet 2- The second page with only two problems is purposeful. You can use these as DO NOW problems or review.

#### 2 x 1 Practice Sheets

Just two more to give you even more practice.

- Practice 3 - When you are multiplying large numbers you can use the lattice method to simplify it for you.
- Practice 4 - The lattice uses boxes that break things into place values.
- Practice 5 - Since we have two 2-digit numbers we will need 4 boxes.

#### 2 x 2 Homework and Practice Worksheets

We step it up to the next level 2 digit by 2 digit products.

- Homework 1 - Set the numbers we are multiplying across the top and side of the lattice we have created.
- Homework 2 - Multiply the numbers that meet in each box separate the products into place values using the diagonal line.
- Homework 3 - Add the numbers between the diagonals to get your answer.

#### 3 x 2 Practice Sheets

This might be were the lattice method loses students. Just keep them organized and they shouldn't have any problems.

- Practice 1 - Place numbers involved across the top and side of the lattice.
- Practice 2 - Multiply the numbers that meet at each box. Separate the products place values (tens and ones) using the diagonal line.
- Practice 3 - Find the sum of the numbers that are under the same diagonal line.