比（11岁以上）
Ratio (age 11+)
使用规范的运算顺序记号，包括括号、幂、根和倒数；一致地运用BIDMAS/BODMAS（先括号、再指数、后乘除、最后加减）来求复杂数值表达式的值。
Use conventional notation for the priority of operations including brackets, powers, roots, and reciprocals; apply BIDMAS/BODMAS consistently to evaluate complex numerical expressions
学习证据 / Evidence
- 按正确顺序计算包含括号、指数和四则运算的表达式。
- 解释为什么运算顺序是必要的，以避免产生歧义。
- 能运用一个数的倒数，并理解一个数乘以它的倒数等于1。
- Evaluate expressions involving brackets, indices, and all four operations in the correct order
- Explain why the order of operations is necessary to avoid ambiguity
- Use the reciprocal of a number and understand that a number multiplied by its reciprocal gives 1
评估问题 / Assessment
{{name}}能否正确计算像‘5 + 2³ ÷ 4’这样的复杂表达式——按照正确的运算顺序，先算乘方，再算除法，最后算加法？
Can {{name}} evaluate a complex expression like '5 + 2³ ÷ 4' correctly — applying the right order of operations, handling the power before the division and division before the addition?