# What are factors?

• The factors of a number are any numbers that divide into it exactly.

For example:

The factors of $${6}$$ are $${1}$$, $${2}$$, $${3}$$ and $${6}$$.

The factors of $${10}$$ are $${1}$$, $${2}$$, $${5}$$ and $${10}$$.

The factors of $${11}$$ are $${1}$$ and $${11}$$ (so $${11}$$ is a ).

Question

What are the factors of the following numbers?

1. $27$
2. $16$
3. $40$
1. $$1$$, $$3$$, $$9$$, $$27$$
2. $$1$$, $$2$$, $$4$$, $$8$$, $$16$$
3. $$1$$, $$2$$, $$4$$, $$5$$, $$8$$, $$10$$, $$20$$, $$40$$