An extension task is an additional activity or project provided to students who have completed the primary task or project. The extension task allows students to explore the concepts and skills learned in the lesson more deeply or practice them more thoroughly. It extends learning.
It is not a random task given to them simply to keep them busy.
It may be that the extension task you offer has to be short and sweet. You may wish to keep the student actively engaged for a short period whilst the rest of the class finishes the main task. Then the class can all move on together to the next task or project.
You may have a student who is hungry for more, so the extension task could be longer. You might provide some sort of reward/incentive if they finish it in their own time.
If possible, I like to provide a choice of extension tasks. Different students enjoy different things. It’s fairly easy to provide a variety of drawing, digital or research-based tasks. Here are some ideas.
I think it helps to consistently give the message that if something is started, it needs to be finished. There could be a reward for finishing extra tasks such as points or something that fits in with your whole-school reward system.
Overall, extension tasks allow students to deepen their understanding of the lesson content and extend skills. Being prepared with a variety of options will certainly make your lessons easier.
There are many, many extension tasks on this website that will fit in with your schemes of work and extend your student’s learning.