What you need to know

Things to remember:

  • If we multiply by 1 the number stays the same!
  • If we multiply by 0 the answer is always 0!

Multiplying numbers can be simple when we have 1s or 0s. If we multiply by 1 the number doesn’t change, if we multiply by 0 the answer is always 0.

 What is 12\times0\times4?

12\times0\times5=0\times4=0

 

TIP: Whenever there is a multiplication with a 0, the answer will always be 0!

What is 315\times217\times0?

Try multiplying the 0 first.

315\times217\times0=315\times0=0

When we multiply by 1, our numbers stay the same!

What is [/latex]5\times1\times8[/latex]?

5\times1\times8=5\times8=40

Let’s look at some more examples:

1\times4\times8=4\times8=32

3\times1\times3=3\times3=9

5\times4\times1=5\times4=20

TIP: When there is a \times1, we can just ignore it!

You might also be asked a question like “What is the answer to [/latex]6\times6\times5[/latex]?” So we’ll have two multiplications to do. But you can decide on which order is easiest for you.

6\times6\times5=36\times5=180

6\times6\times5=6\times30=180

Question 1: What is 6\times0\times8?

Example Questions

Question 1: What is 6\times0\times8?

Answer

There is a 0, so the answer has to be 0!  But let’s just check

 

6\times0\times8=0\times8=0

 

 6\times0\times8=0

Question 2: What is 9\times1\times4?

Answer

One of the multiplications is a 1, so we can start by ignoring it.

 

9\times1\times4=9\times4=36

 

 9\times1\times4=36