- Definition
A composite number is a whole number that can be divided evenly by numbers other than just one and itself. For example, 8 is a composite number because it can be divided by 2 and 4, not just 1 and 8.
The number 6 is composite because it can be made by multiplying 2 × 3.
How to teach this in 30 seconds
Try this analogy: A composite number is like a box of cookies that can be arranged into different rectangular shapes, not just a single long line.
Ask your child: How many different rectangles can you make with 12 tiles?
Common mix-up: Kids often think all odd numbers are prime. A composite number can be odd, like 9, which can be made by multiplying 3 x 3.
Examples
- The number 9 is composite because it can be made by multiplying 3 × 3.
- 10 is a composite number because it can be made by multiplying 2 × 5.
composite number is a term used in Ontario’s Kindergarten to Grade 8 curriculum.
Where this shows up
The descriptions on this page are SmartStudy’s own original, plain-language writing — not the Ministry’s wording. They are aligned to the Ontario Curriculum, © King’s Printer for Ontario. For the Ministry’s official wording, see the source link below. SmartStudy is an independent service and is not affiliated with, endorsed by, or sponsored by the Government of Ontario or the Ministry of Education. Ontario Curriculum and Resources ↗
