Learn what variables are and how to work with them
A variable is a letter or symbol that represents a number we don't know yet.
We typically use:
"Sarah is 5 years older than her brother."
Let = brother's age Then Sarah's age =
If brother is 10: Sarah is If brother is 8: Sarah is
A square has 4 equal sides.
Let = length of one side Perimeter =
If : Perimeter =
| Term | Definition | Example |
|---|---|---|
| Variable | Letter representing an unknown | in |
| Coefficient | Number multiplied by a variable | in |
| Constant | A number without a variable | in |
When you see , think: