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These 2 examples are similar in nature, except that pupils from Primary and Secondary levels are equipped with a different set of prior knowledge/skills... hence, they will solve the problem differently.
The problem is open and resembles real world problem that comes to unknown parameters. Hence, to solve the problem, pupils would
- ask questions to understand the problem better
- based on the inputs/questions from the class, they would decide on the parameters, hence the re-state the problem so that it becomes solvable, based on the assumptions
- learn to select and apply appropriate methods to solve the problem
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