运算顺序
Order of operations
理解并运用常规的运算顺序（如PEMDAS/BODMAS），完成涉及四则运算的计算。
Understand and apply the conventional order of operations (PEMDAS/BODMAS) to carry out calculations involving the four operations
学习证据 / Evidence
- 通过说明先算乘法再算加法，解释为什么8 + 2 × 5 = 18（而不是50）。
- 正确计算像12 ÷ 3 + 4 × 2这样的多步算式，得出12。
- 说出正确的运算顺序：先括号，再乘方或指数，然后乘除（从左到右），最后加减（从左到右）。
- Explain why 8 + 2 × 5 = 18 (not 50) by referencing multiplication before addition
- Evaluate a multi-step expression like 12 ÷ 3 + 4 × 2 correctly as 12
- State the correct order: brackets, then orders/exponents, then multiplication/division (L→R), then addition/subtraction (L→R)
评估问题 / Assessment
如果{{name}}看到“8 + 4 × 3”，他们会得出20——而不是36——因为他们知道要先算乘法再算加法吗？
If {{name}} sees '8 + 4 × 3', do they get 20 — not 36 — because they know to do the multiplication before the addition?