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Multiplication up to Three Digits using the Grid Method

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Basics on the topic Multiplication up to Three Digits using the Grid Method

Learn to Multiply 1-Digit by 2 and 3-Digit Numbers

Are you ready to explore the world of multiplication? In this text, we'll delve into the fascinating method of 2 digit by 1 digit multiplication and 3 digit by 1 digit multiplication using an area model. This is also known as the grid method. This powerful technique will help you tackle multiplication problems with confidence. Once you learn how to use this method with 2-digit or 3-digit numbers, you will be able to use it with multi-digit numbers, too!

Multiplication 2 digit by 1 digit – Guided Practice

When solving 2 by 1 digit multiplication problems, the area model, or grid method, comes to the rescue.

The area model, or grid method, is a visual representation that simplifies the multiplication process.

So, what are the steps of 2-digit multiplication? Let's walk through a step-by-step example of 1 digit by 2 digit multiplication to illustrate how it works.

Let’s start with the first example of 2 digit multiplication by 1 digit: multiplying 38 by 5.

Step 1: Setting up the model

Begin by drawing a rectangle. Divide the rectangle into segments based on the number of place values in each number. In our example, 38 has two place values (tens and ones), so we split our rectangle into two parts. The number 5, being a 1-digit number, doesn't require further division.

Step 2: labeling the parts

Now, label each part with the expanded form of the factors. On the top, write "30 + 8", representing the number 38. On the left side, write the number 5.

Step 3: Finding partial products

The next step is to multiply each corresponding pair to determine the partial products. These are the results obtained when you multiply each part of one number with each part of the other number.

In our example, we start with the leftmost segment. Multiply 5 by 30 to get 150. Then, multiply 5 by 8, which equals 40.

Step 4: Summing up

To find the final answer, add up the partial products. In this case, the sum of the partial products is 190, which means that 38 multiplied by 5 equals 190.

Multiplication 3 digit by 1 digit – Guided Practice

When solving 3 by 1 digit multiplication problems, the area model comes to the rescue. Let's walk through a step-by-step example of area model multiplication 3 digit by 1 digit to illustrate how it works.

Let’s look at the following example: Multiplying 245 by 3

Step 1: Setting Up the Model

When multiplying 3-digit by 1-digit numbers, begin by drawing a rectangle. Divide the rectangle into segments based on the number of place values in each number. In our example, 245 has three place values (hundreds, tens and ones), so we split our rectangle into three equal parts. The number 3, being a 1-digit number, doesn't require further division.

24948_SEO_Line--01.svg

Step 2: Labeling the Parts

Now, label each part with the expanded form of the factors. On the top, write "200 + 40 + 5", representing the number 245. On the left side, write the number 3.

24948_SEO_Line--02.svg

Step 3: Finding Partial Products

The next step is to multiply each corresponding pair to determine the partial products. These are the results obtained when you multiply each part of one number with each part of the other number.

In our example, we start with the leftmost segment. Multiply 3 by 200 to get 600. Then, multiply 3 by 40, which equals 120. Finally, multiply 3 by 5, resulting in 15.

24948_SEO_Line--03.svg

Step 4: Summing Up

To find the final answer, add up the partial products. In this case, the sum of the partial products is 735, which means that 245 multiplied by 3 equals 735.

Multiplying a Multi Digit Number with 1-Digit Numbers – Summary

In summary, the area model simplifies the process of multiplying a 2-digit or 3-digit number by a 1-digit number. It's a valuable tool for learners of all ages, and with our example and guided practice exercises, you can enhance your multiplication skills effectively.

Remember, when multiplying a multi digit number by a 1-digit number, using the area model, or grid method is easy. You need to follow these steps:

Step # What to do
1 Setting up the model
2 Labelling the parts
3 Finding partial products
4 Summing up

For additional resources, 2 digit by 1 digit multiplication word problems and exercises, visit our website to find multiplication 3 digit by 1 digit worksheets, 2 digit by 1 digit multiplication worksheets and more!

Frequently Asked Questions on How to Multiply a Multi Digit Number with 1-digit Number

How do you do 2-digit by 1 digit multiplication? How do you multiply a 3 digit number by a 1 digit number?
How do I use the area model for multiplication?
Can you provide more examples of 3-digit by 1-digit multiplication using the area model?
Is the area model suitable for other types of multiplication?
Are there downloadable resources available for practicing multiplication?
Can I use the area model for more complex multiplication problems?

Transcript Multiplication up to Three Digits using the Grid Method

What is Mr. Squeaks doing with all of that stuff? Oh, Imani needs it to fuel the time machine so they can travel to the Stone Age! Before he gives them to Imani, he needs to calculate how many stones, clocks and shoes he has. In order to do that, we will practise multiplication up to three-digits using the grid method. The grid method involves drawing a rectangular model to helps us find the product of two numbers. Mr. Squeaks has five boxes with thirty-eight clocks in each. Let's help Mr. Squeaks calculate by multiplying thirty-eight times five. The first step is to set up our grid. Start by drawing a rectangle. Next, split it into the number of parts based on how many place values are in each number. Thirty eight has two place values, tens and ones, so we split our rectangle into two parts. Five has one place value so we don't break the rectangle into any more parts. Next, label each part by writing the factors in expanded form. The value of the three in the tens place is thirty and the value of the eight in the ones place is eight so we label the top thirty plus eight. Then, we label the five on the left side. The second step is to multiply each corresponding pair to find the partial products. Partial products are the answers we get when each pair of factors is multiplied. In the box on the left, we multiply five times thirty. Remember, you can ignore the zeros at first to get fifteen and then annex one zero to your answer. Five times thirty equals one hundred and fifty. Now we multiply five times eight in the box on the right, which equals forty. After we find all of the partial products, the third step is to add them. This will give us the answer to our multiplication problem. One hundred and fifty plus forty is one hundred and ninety so they have one hundred and ninety clocks. Mr. Squeaks has eight boxes with seventy-six shoes in each. We need to find the product of seventy-six times eight. First, let's set up our area model by drawing a rectangle, breaking it into parts and labelling it. When we label using expanded form, we have seventy plus six on the top and eight on the left. The second step is to multiply each corresponding pair to find the partial products. Let's find the partial product for the box on the left. What is eight times seventy? Eight times seventy equals five hundred and sixty. Now let's find the partial product for the box on the right. Eight times six equals forty-eight. Last, what is the sum of the partial products? Five hundred and sixty plus forty-eight equals six hundred and eight. That means Mr. Squeaks has six hundred and eight shoes for the time machine. Finally, Mr. Squeaks has three boxes with two hundred and forty-five stones in each. We need to find the product of two hundred and forty-five times three. The first step is to set up our grid but how does this look with a three-digit number? We still label it using expanded form, but now the model is broken into three parts since we are calculating a three-digit number. How do we label it? The top is labelled using the expanded form two hundred plus forty plus five and the three goes on the left. The second step is to multiply to find the partial products. This time, try multiplying on your own. The partial products are six hundred, one hundred and twenty and fifteen. Now, what do we do with the partial products? The last step is to find the sum of the partial products. The sum of the partial products is seven hundred and thirty-five which is the number of stones Mr. Squeaks has for the time machine. Remember, when we solve a multiplication problem using the grid method, the first step is to set up the grid. The second step is to multiply each corresponding pair to find the partial products. The third step is to find the sum of the partial products. Let's see if the time machine has enough fuel. It looks like it's working...

Multiplication up to Three Digits using the Grid Method exercise

Would you like to apply the knowledge you’ve learnt? You can review and practice it with the tasks for the video Multiplication up to Three Digits using the Grid Method.
  • Can you solve the multiplication problem?

    Hints

    Have you multiplied each side of the grid?

    After you have multiplied each side, your grid should look like this.

    Have you added the partial products together?

    Don't forget any zeros!

    Solution

    First of all, solve the equation on the left:

    • 4 x 30 = 120
    Then solve the equation on the right:

    • 4 x 9 = 36
    120 and 36 are the partial products, so we then need to add them together.

    • 120 + 36 = 156
    Therefore, 4 x 39 = 156

  • Can you complete the grid and solve the problem?

    Hints

    Multiply each part separately. In this example 20 is being multiplied by 4, then 2 is being multiplied by 4.

    At the bottom we need to add the partial products, and then complete the original multiplication problem.

    Solution

    Mr. Squeaks had 5 boxes with 68 pencils in each. This is how the grid looks when it is completed.

    • We multiply 5 by 60 to get 300.
    • Then we multiply 5 by 8 to get 40.
    • We then add 300 and 40 to get 340.
    • 68 x 5 = 340.
  • Can you spot the mistakes in the grid?

    Hints

    Think about how we partition a three digit number, has it been done correctly here? What should 248 be partitioned into?

    What should the first digit in each of the three grid equations be?

    Have the zeros been added on if necessary?

    Solution

    The image above shows the mistakes highlighted.

    • When partitioning a three digit number we need only the hundreds in the first box, so this should have been 200, both above the box and in the first box.
    • 4 x 40 is 160, not 16. We can multiply 4 x 4 first to make it easier, but the 0 needs adding onto the end again.
    • In the third box the first number should have been 4, as that is what we are multiplying 248 by.
    • The final answer at the end is incorrect because of the mistakes in the grid. 248 x 4 = 992.
  • Can you find the correct answers to the multiplication problems?

    Hints

    Have you partitioned the two or three digit number?

    This example shows how we could set up 32 x 3 on a grid.

    Solution

    The grid above has been filled in for the problem 42 x 7. 42 has been partitioned into tens and ones to give 40 and 2.

    To solve:

    • First of all we multiply 7 by 40 to get 280.
    • We then multiply 7 by 2 to get 14.
    • Now we need to add 280 and 14 to get 294.
    • Therefore 42 x 7 = 294.
    _____________________________________________________________

    • 83 x 3 = 249
    • 113 x 4 = 452
    • 167 x 6 = 1,002
    • 207 x 2 = 414
    • 325 x 3 = 975
  • Can you complete the grid and find the answer?

    Hints

    Remember to multiply 3 by the tens and the ones of the two digit number.

    Add up your products to find the answer to the multiplication problem.

    Solution

    Here is the completed grid:

    • 3 x 30 = 90
    • 3 x 5 = 15
    • We then add 90 and 15 to get 105.
    • Therefore, 35 x 3 = 105.
  • Can you solve the multiplication problems?

    Hints

    Remember to partition your two or three digit number.

    Add the partial products to find the answer.

    Solution

    For the first problem:

    • We need to partition 39 into 30 and 9.
    • We then multiply 8 by 30 to get 240, and 8 by 9 to get 72.
    • Next, add 240 and 72 to get 312.
    • Therefore, 39 x 8 = 312

    ________________________________________________________

    For the second problem:

    • Partition 76 into 70 and 6.
    • Multiply 4 by 70 to get 280, and 4 by 6 to get 24.
    • Add 280 and 24 to get 304.
    For the third problem:
    • Partition 122 into 100, 20 and 2.
    • Multiply 6 by 100 to get 600, 6 by 20 to get 120, and 6 by 2 to get 12.
    • Add 600, 120 and 12 to get 732.
    For the fourth problem:
    • Partition 341 into 300, 40 and 1.
    • Multiply 7 by 300 to get 2,100, 7 by 40 to get 280, and 7 by 1 to get 7.
    • Add 2,100, 280 and 7 to get 2,387.