Strategy Trail 🧭
Smart explorers plan before they walk. For each case, choose the most efficient plan first, then use it to find the answer. One case needs the calculator.
Step 1 · Choose the smartest plan
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How to play Strategy Trail
- Read the problem, for example 199 + 56 or 72 ÷ 4.
- Step 1: choose the smartest plan from three. The best plan turns green.
- Step 2: use that plan and pick the answer from four options.
- On the last case, use the on-screen calculator, but estimate first.
- Ten cases. The end screen shows both your correct answers and your smart plans.
Mental maths strategies for Year 4
Bridging (round to a friendly number, then adjust), compensating, building from known multiplication facts, doubling and halving, and counting up to find a difference are the main efficient strategies for Year 4. Children who can choose a strategy, not just follow one, solve problems faster and catch their own errors, and they know when a calculator is the better tool.
For grown-ups
Every case has two steps: choosing a plan, then the answer. The plans practised are bridging through a friendly number (199 + 56 → 200 + 56 − 1), compensating in subtraction (503 − 200 + 2), building from known facts (6 × 8 = 5 × 8 + 8), doubling and halving for × 4 and ÷ 4, and counting up for differences. All divisions come out without a remainder. The last case is deliberately a calculator job: four 4-digit amounts. Estimating first (about 12 300) is how you catch a mistyped key, which is the "appropriate digital tools" part of AC9M4N06 in the Australian Curriculum v9.