Step 3 Objective

Explain a generalised relationship (formula) in words.

Examples of what pupils should know and be able to do

Explain how to find the number of days in any number of weeks.

Describe a short way to work out the perimeter of a rectangle.

A sequence starts 1, 4, 7, 10...

Explain in words the rule for the sequence.

Probing questions

How do you know when two number or quantities are linked by a rule?

What clues do you look for?

How do you go about finding the rule?

What if pupils find this a barrier?