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Multiplying and dividing by 1 and multiplying by 0

Multiplying and dividing by 1 and multiplying by 0

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Explainer Video

Tutor: Alice

Summary

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\times1739×1?


The answer is the number that you started with. 

739‾\underline{739} 739​


Note: You can think of this as 739739739 lots of one, or one lot of 739739739.



Example 2

What is 652÷1652\div1652÷1?


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

652‾\underline{652} 652​


Note: This is like saying share 652652652 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\times043×0?


The answer is always zero.

 0‾\underline{0} 0​


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


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Learn with Basics

Learn the basics with theory units and practise what you learned with exercise sets!
Length:
Multiplying and dividing by 2, 3, 4 and 8

Unit 1

Multiplying and dividing by 2, 3, 4 and 8

Times tables up to 12 x 12

Unit 2

Times tables up to 12 x 12

Jump Ahead

Score 80% to jump directly to the final unit.

Optional

Multiplying and dividing by 1 and multiplying by 0

Unit 3

Multiplying and dividing by 1 and multiplying by 0

Final Test

Test reviewing all units to claim a reward planet.

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FAQs - Frequently Asked Questions

Can I divide by 0?

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

What do I get when I multiply by 0?

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

What do I get when I multiply by 1?

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

What do I get when I divide by 1?

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

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