📚 給家長的話 · For Parents

🎯 學習重點 · Learning Focus

「算式變換」是函數思維的啟蒙：小朋友要先從例子歸納規則（5 變 9，原來是加 4），再將規則應用到新數字（3 變 7）。這種「歸納再演繹」的推理，正是小一常見的「找規律」題目，也是日後學習代數的基礎；同時反覆練習 10 以內、20 以內及 100 以內的加減運算，並在第四關鞏固十位數的位值概念。

"Number transforms" are a first taste of function thinking: children must infer a rule from an example (5 becomes 9 — the mirror adds 4), then apply that rule to new numbers (3 becomes 7). This "induce, then deduce" reasoning appears in Primary One pattern questions and lays the groundwork for algebra later on, while drilling addition and subtraction within 10, 20, and 100 — with the final sublevel reinforcing the tens place.

👨‍👩‍👧 陪玩小貼士 · Playing Together

鼓勵小朋友先「說出法則」才作答 — 能說出「鏡子加了 4」，才代表真正明白。如果看不出規則，引導他比較例子的兩個數：「9 比 5 大多少？用手指或數線數一數相差多少。」答錯時，請他重新檢查例子，而不是直接告訴他答案 — 找出自己的錯誤，印象最深刻。

Encourage your child to say the rule out loud before answering — being able to say "the mirror adds 4" shows real understanding. If the rule isn't obvious, compare the two numbers in the example: "how much bigger is 9 than 5? Count the difference on your fingers or a number line." When an answer is wrong, ask your child to re-check the example instead of giving the answer — finding their own mistake leaves the deepest impression.

🏠 生活延伸練習 · Everyday Practice

在家玩「魔法機器」：家長心中定一條秘密規則（例如加 3），小朋友說出一個數字，家長說出變換後的數字；兩三個回合後，讓小朋友猜出規則。之後角色對調，由小朋友定規則考家長 — 要出得合理又要算得準，其實更考功力！搭車、等位時不用任何道具都玩得到。

Play the "magic machine" at home: secretly choose a rule (e.g. add 3), have your child call out a number, and you answer with the transformed number; after two or three rounds, your child guesses the rule. Then swap roles and let your child set the rule to test you — keeping it sensible and accurate is harder than it looks! No props needed, so it works on the bus or in a queue.