Lesson

Multiplication looks at equally sized groups. Can you solve this problem?

Find the value of 8 \times 5.

Worked Solution

Idea summary

Thinking of multiplication as equally sized groups of objects can make multiplication easier.

9 groups is 1 less than 10 groups. Let's look at how we can use this to help us learn the 9 times tables.

Find the value of 5\times9.

Worked Solution

Idea summary

When mutiplying by 9:

- 9 groups can be thought of as 10\text{ groups }- 1\text{ group.}
- When we look at the answers up until 9\times10, the units have a descending pattern and the tens have an increasing pattern: 9, \, 18, \, 27, \,36, \, \ldots
- If we add the digits in the answers of the nine times tables until we get a single digit, that digit is always 9.

uses mental and informal written strategies for multiplication and division