Multiply Four-Digit Numbers by a One-Digit Number

In this activity, we will learn about the multiplication of two numbers.

 

 

 

Example

There are 3,136 horses. Each horse has 4 legs. How many legs are there altogether?

 

Answer:

Number of legs = 3,136 × 4

 

Step 1: Multiply the thousands by 4. 

4 x 3,000 = 12.000

 

Step 2: Multiply the hundreds by 4.

4 x 100 = 400

 

Step 3: Multiply the tens by 4.

4 x 30 = 120

 

Step 4: Multiply the ones by 4.

4 x 6 = 24

 

Step 5: Add the answers altogether.

12,000 + 400 + 120 + 24 = 12,544

 

×		3	1	3	6
					4
4 × 3000	1	2	0	0	0
4 × 100			4	0	0
4 × 30			1	2	0
4 × 6				2	4
	1	2	5	4	4

 

So there are 12,544 legs altogether.

 

That's a lot of legs!

 

 

Let's have a go at some questions now.