Multiply by 1

key notes :

Multiplication is a shortcut for adding the same number over and over.

When you see a multiplication equation, it’s telling you how many times to add the same number. 👍

Multiplying by 1 is fun.

💡 Any number times 1 is just itself.

  • 1 × 0 =0
  • 1 × 1 =1
  • 1 × 2 =2
  • 1 × 3 =3
  • 1 × 4 =4
  • 1 × 5 =5
  • 1 × 6 =6
  • 1 × 7 =7
  • 1 × 8 =8
  • 1 × 9 =9
  • 1 × 10 =10
  • 1 × 11 =11
  • 1 × 12 =12

Let’s look at some examples to see if that’s true.

Learn with an example

Multiply.

1 x 8 =____

The identity property of multiplication says that the product of any number and 1 is that number. So, the product of 1 and 8 is 8.

You can also look at this model to see that 1 × 8 = 8.

1 row with 8 dots in it has 8 dots in all.

3 x 1 = ?

Here’s a picture of what 3 times one pencil looks like.

3 x 1 = 3!

Multiply.

6 × 1 =

The identity property of multiplication says that the product of any number and 1 is that number. So, the product of 6 and 1 is 6.

6 × 1 = 6

You can also look at this model to see that 6 × 1 = 6. This model shows 6 rows with 1 dot in each row. There are 6 dots in all.

This number line also shows that 6 × 1 = 6. Count by 1s on the number line. Count forward 6 times.

The last arrow ends at 6.

6 × 1 = 6

let’s practice!