The skills section gives learners quick practise on the technique to ensure they are comfortable with it and this has the advantage of being easy to self-assess the following lesson.
Following a homework, the stretch question is done in class, with those that have been able to complete it giving input of their ideas and strategies for solving. I particularly liked Q2 here on linear equations!
Maths teachers everywhere seem to be jumping on this - with Jo @mathsjem compiling them all into this handy website!
