What is Interweaving?
Excellent question.
Interweaving, and interleaving, are terms that different people use in different ways. This is my interpretation.
There are benefits to be gained from questions and tasks that bring together several topics from mathematics. For example, if you are teaching how to find the nth term rule of arithmetic sequences, then using fractions in those sequences gives pupils practice with fractions, makes the nth term process less routine, and helps pupils notice the connections between different bits of mathematics.
Similarly, asking pupils to form and solve equations from angles in parallel lines gives practice with equations, substitution and angle facts at the same time. It also makes the angle facts less obvious than when every angle is either 70 degrees or 110 degrees.
The more pupils meet these connected tasks, the more they can appreciate maths as a subject full of structure and relationships. They also get useful review, fluency, long-term recall and practice applying ideas in new contexts.
That is why I made this site. Creating interwoven tasks is quite laborious, so I hope a repository of thought-through tasks, each connecting different topics, is useful. Most tasks include editable PowerPoints that you can use, adapt and improve.
Good places to start: