3. Multiplication and division
Lesson
Are you ready?
Can you remember another way to write a problem like 3+3+3+3, which is called repeated addition?
Examples
Example 1
Write this addition as a multiplication. 3+3+3+3+3+3
Worked Solution
Idea summary
We can rewrite the addition as a multiplication using: \text{Number of groups}\times\text{Amount in each group}
Repeated addition
In this video we see how adding the same number over and over is the same as multiplication.
Examples
Example 2
Answer the following:
a
Write this addition as a multiplication: 12+12+12+12+12+12+12+12
Worked Solution
b
Find the value of 8 \times 12.
Worked Solution
Idea summary
If we add something over and over, it's like having many groups of that number. When we have groups of something, we call that multiplication, and we use \times for multiplication.
6+6+6+6+6 is the same as 5 groups of 6, or 5 \times 6.