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Chapter Overview

Maths

Number and place value

Addition and subtraction

Multiplication and division

Fractions

Measurement

Geometry - properties of shapes

Geometry - position and direction

Statistics

Maths

Multiplying and dividing by 1 and multiplying by 0

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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 739×1739\times1?


The answer is the number that you started with. 

739‾\underline{739}


Note: You can think of this as 739739 lots of one, or one lot of 739739.



Example 2

What is 652÷1652\div1?


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

652‾\underline{652}


Note: This is like saying share 652652 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 43×043\times0?


The answer is always zero.

 0‾\underline{0}


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


Frequently Asked Questions (FAQ)

FAQs

  • Question: Can I divide by 0?

    Answer: You CANNOT divide by zero. This is an important rule in maths.

  • Question: What do I get when I multiply by 0?

    Answer: When you multiply by zero, no matter what number you multiply it by, the answer is always 0.

  • Question: What do I get when I multiply by 1?

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

  • Question: What do I get when I divide by 1?

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

Theory

Exercises

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