Why do this problem?
will encourage children to draw diagrams and mark measurements on them in the process of solving the problem.
Would it be a good idea to draw a diagram of the tree and its shadow, and the stick and its shadow?
Would using a calculator help you?
Learners could try Hello Again
which is a Stage 3 problem.
Suggest starting by drawing a diagram of the tree and its shadow, and the stick and its shadow. Alternatively, learners could try Once upon a time
which is a similar, but easier, problem.