This is a great task to use within the classroom. We have used it both as an end of topic assessment tool and as a Portfolio task to go home to parents. This task is best printed on A3 sized paper to endure plenty of room for little people's writing.
Students with additional learning needs: writing can be replaced with showing the problem in picture form, concrete materials used to decide and work out the problem together before having a go on paper.
Extension students: because this task is open ended, you can encourage students to challenge themselves and discuss with the class what they have done and how they reached their answers for each section.
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