Write Missing Terms in a Sequence from a Given Rule

This activity is about following a simple rule to find missing terms in a sequence.

Example 1

Write down the first five terms of a sequence starting with 9 and adding 4 each time.

9  +4  13  +4  17  +4  21  +4  25 

 Example 2

Write down the first five terms of a sequence starting with 89 and subtracting 11 from the previous term.

89  -11  78  -11  67  -11  56  -11  45

Let's have a go at some questions now.