Look at this number sequence.
12, 14, 16, 18, 20, ...
The sequence starts at 12 and the rule is to add 2 to the previous term.
The 1st term is 12.
The 2nd term is 14.
The 3rd term is 16.
The 4th term is 18.
The 5th term is 20.
Example
A sequence starts at 15 and follows the rule to add 3 to the previous term.
What is the 5th term of this sequence?
Answer
The 1st term is 15.
The 2nd term is 15 + 3 = 18.
The 3rd term is 18 + 3 = 21.
The 4th term is 21 + 3 = 24.
The 5th term is 24 + 3 = 27.