Lesson

Do you remember how multiplication can be thought of as repeated addition ?

Answer the following:

a

Write this addition as a multiplication:\,\, 10+10+10+10+10+10+10+10

Worked Solution

b

Find the value of 8 \times 10.

Worked Solution

Idea summary

If we are adding groups of the same size, we can also write it as a multiplication:

\text{Number of groups}\times\text{Amount in each group}

In this video we see how rows and columns (called an array), can be used to solve multiplication.

Which of these number sentences describe the array?

There may be more than one correct answer.

A

8 \times 2 =16

B

16 \times 2 = 8

C

2 \times 8 =16

Worked Solution

Idea summary

We get the same answer whichever way we look at our array.

uses mental and informal written strategies for multiplication and division