Learn how to use an array to see the commutativity of multiplication facts (for example 3 x 5 is the same as 5 x 3).
This lesson includes:
- two videos
- three activities
What is an array?
An array is a way of representing multiplication facts in a diagram or picture. It is always rectangular and made up of rows and columns.
An array is helpful for calculating multiplication statements, for example, 2 x 4 which can be shown using this array:
There are 2 rows of apples and 4 apples in each row.
There are 4 columns of apples and 2 apples in each column.
This array shows the multiplication statements 2 x 4 and 4 x 2.
The array has 8 apples in total. This tells us that 2 x 4 and 4 x 2 are both equal to 8.
2 x 4 = 8 and 4 x 2 = 8
Here is an array to show a multiplication fact:
There are 3 rows of sweets and 5 sweets in each row.
There are 5 columns of sweets and 3 sweets in each column.
This array shows the multiplication statements 3 x 5 and 5 x 3.
The array has 15 apples in total. This tells us that 3 x 5 and 5 x 3 are both equal to 15.
3 x 5 = 15 and 5 x 3 = 15
Remember multiplication is commutative.
4 x 3 is the same amount as 3 x 4.
4 lots of 3 is the same amount as 3 lots of 4.
Here is an array to show 6 x 2
Can you see 6 lots of 2?
Can you see 2 lots of 6?
How many footballs are there in the array?
This array shows that 6 x 2 = 2 x 6.
Can you draw an array to show 3 x 4?
Which other multiplication fact does it show?
Does it help you calculate 4 x 3?
An array is a rectangular diagram to show a multiplication fact. It always has rows and columns and shows that multiplication is commutative.
Make an array activity
Try this interactive activity to see if you can answer the question by making your own array.
Test your skills on this topic even further by playing Karate Cats Maths - see if you can collect a new costume for your cat!
There's more to learn
Have a look at these other resources.