Algebra 1 · Functions & Sequences
Common Ratio
Algebra 1 · Functions & Sequences
Definition
The common ratio is the fixed amount each term is multiplied by to get the next in a geometric sequence.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- In 2, 6, 18, 54, the common ratio is 3.
- In 80, 40, 20, the common ratio is 1/2.
Key rule
Divide any term by the one before it to find it.
Memory hook
Common ratio − the steady multiplier.