6. Multiplication strategies
Lesson
Are you ready?
Let's try this problem to help us remember how to double a number.
Examples
Example 1
Double 9.
Worked Solution
Idea summary
To double a number, we multiply the number by 2.
Repeated addition
When we add the same number more than once, we can think of it as multiplication, as we see in this video.
Examples
Example 2
Write this addition as a multiplication. 4+4+4+4
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}