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Math for Kids23 chapters | 325 lessons

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Lesson Transcript

Instructor:
*Cori Hodges*

Cori has degrees in Elementary Education and Early Childhood Education and has taught lower elementary.

Did you know there is more than one way to multiply numbers? In this lesson, we'll talk about some different ways to multiply to help you find the one that is easiest for you.

This lesson will cover four different ways to multiply numbers: addition, memorizing the grid method, long multiplication, and drawing lines. Learning about each of them will help you decide which method works best for you.

One of the most basic ways to multiply is to add. When we multiply two numbers, we're simply adding one number to itself a certain number of times. For example, if the problem says to multiply 20 x 5, you're adding the number 20 to itself five times. So:

20 + 20 + 20 + 20 + 20 = 100

Or:

20 x 5 = 100

When using **grid multiplication**, you separate your numbers into boxes. The problem in this grid is asking you to multiply 23 x 74. In the top row, the number '23' appears as '20' and '3'. In the first column on the left, the number '74' appears as '70' and '4'.

Multiply the first number in the top row by the first number in the first column:

20 x 70 = 1,400

Then multiply the next number in the top row by 70:

3 x 70 = 210

Next, multiply the first number in the top row by the second number in the first column:

20 x 4 = 80

Finally, multiply 3 x 4 = 12.

Now, add the answers together:

1,400 + 210 + 80 + 12 = 1,702

**Long multiplication** is a way to multiply two multiple-digit numbers. For instance, let's say that a multiplication problem asks you to multiply 364 x 32. Begin by writing the problem on a piece of paper. Then multiply the top number (364) by the bottom right number (2), shown in red, and write that below the line. Now, multiply the top number (364) by the bottom left number (3), shown in blue. When you write your answer down, leave a space for a zero. Then add the two answers together to obtain your final answer:

728 + 10,920 = 11,648

**Drawing lines** is one of the newer methods of multiplication in the United States. It is a method that has been used by the Japanese. Let's take the problem 12 x 24. To solve the problem, you would first draw lines to represent the numbers given.

These lines are color coordinated with the numbers they represent. The first number in the problem, '1,' and the lines representing it are yellow. The second number, '2,' and the lines representing it are blue. The other numbers, '2' and '4,' are shown in red and green.

After the diagonal lines are drawn, curved lines are drawn to separate the contact points between the lines into sections. Count each contact point in each section, and that will give you the answer to your problem. Section 1 had two contact points (2). Sections 2 and 3 each had eight contact points (8); so the answer to this problem is 288.

There are several ways to solve multiplication problems. Whether you prefer to use **addition**, since when we multiply we're simply adding one number to itself a certain number of times; **long multiplication**, or a way to multiply two multiple-digit numbers; **grid multiplication**, or when you separate your numbers into boxes; or **drawing lines**, a newer method they use in Japan that involves drawing lines that represent the given numbers, being familiar with each of the different ways can help you decide which method works best for you.

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Math for Kids23 chapters | 325 lessons

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