# Multiplying and dividing by 1 and multiplying by 0

## In a nutshell

When multiplying and dividing by one or multiplying by zero, there are special rules to follow.

## Multiplying and dividing by 1

No matter what the number you want to multiply or divide by one is, the answer is always the same as the number that you started with.

##### Example 1

*What is *$739\times1$*?*

*The answer is the number that you started with. *

$\underline{739}$

*Note:** You can think of this as *$739$* lots of **one, or one** lot of *$739$*.*

##### Example 2

*What is $652\div1$?*

*Again, the answer is the number that you started with.*

*$\underline{652}$*

**Note: **This is like saying share $652$* into one part.*

## Multiplying by 0

Multiplying by zero is just as easy - no matter what number you multiply it by, the answer is always 0.

##### Example 3

*What is *$43\times0$*?*

*The answer is always zero.*

$\underline{0}$

**Note:** Unlike with one, you CANNOT divide by zero. This is an important rule in Maths.