IXL | Find all the factor pairs of a number

Find all the factor pairs for 28 and complete the equations.

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Learn with an example

question

Find all the factor pairs for 21 and complete the equations.

key idea

A factor of a number divides the number evenly.

A factor pair for a number is a pair of factors whose product is that number. For example, 2 and 5 are a factor pair for 10 because

solution

Each of the equations is missing a factor. In the first equation, one of the factors is 21. You can use a multiplication fact to find the missing factor.

So, 1 and 21 are a factor pair for 21.

In the second equation, one of the factors is 3. You can use a multiplication fact to find the missing factor.

So, 3 and 7 are a factor pair for 21.

These equations show all the factor pairs for 21:

Looking for more? Try these:

Lesson: Factors

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Teacher tools

Work it out

Not feeling ready yet? These can help:

J.3Division facts to 12

F.4Divisibility rules

F.1Identify factors

Lesson: Factors

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