Number and algebra: My thinkboard

### Summary of task

The students were presented with a basket containing five skipping ropes. They were told that previously there was a basket full of skipping ropes and were asked to list three different solutions to how many skipping ropes had gone missing. Students gave the strategy that was used for each solution.

### Proficiencies

At this year level problem-solving includes using materials to model authentic problems, giving and receiving directions to unfamiliar places, using familiar counting sequences to solve unfamiliar problems and discussing the reasonableness of the answer.

At this year level reasoning includes explaining direct and indirect comparisons of length using uniform informal units, justifying representations of data and explaining patterns that have been created.