Rich tasks
The taniwha’s forest
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1. The taniwha’s forest
- This task requires students to use the strategies they have learned for adding one and two-digit numbers in order to identify a missing combination. Encourage students to work systematically to find all possible combinations and to write them down. For example, (0 + 0) + (0 +1) + (0 + 2) etc. so that no combination is missed.
- It is important that students realise that the combinations on the eggs only occur once and cannot be duplicated as if the egg was turned around, i.e. (6 + 0) or (0 + 6) but not both.
Adding and subtracting by choosing a strategy page 88
- Solve 2- and 3-digit addition and subtraction problems by choosing an efficient strategy.
- Justify the efficiency of the strategy chosen.
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Teacher notes
- Examples of some of the strategies covered in previous chapters are given at the beginning of Activity 1. These could be printed out and given to students or displayed as a prompt to help them recall strategies they know, or as a scaffold for recording their thinking.
- Students benefit from comparing and justifying their choice of strategy. Therefore, students could be prompted regularly to consider which strategy is more efficient. To do this, they could think about:
• which is easier (especially done mentally);
• which is quicker (often because it has fewer steps), or
Often there is no one correct strategy, but students should reflect on what works best for others as well as what works best for themselves.
