**This activity includes two short spreadsheet tasks on sequences.**These can be used to help pupils generate rules and predict terms.

The activities are:

- Think of a number: an activity that encourages pupils to explore algebraically how the puzzles work.
- Sequences from two numbers: a series of sequences produced from two numbers where pupils need to predict the 10
^{th}and n^{th}terms.

- Understand that algebraic operations follow the rules of arithmetic

- Generate terms of a linear sequence using term-to-term and position-to-term rules, on paper and using a spreadsheet or graphics calculator
- Use linear expressions to describe the terms of a simple arithmetic sequence, justifying its form by referring to the activity or practical context from which it was generated

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