3 + 5 + 8 = ? 17 − 12 − 3 = ? 由左至右，兩步計好！
Three numbers, two steps — work left to right!
全部 20 以內 · All answers within 20
連加連減是 20 以內加減的延伸：3 + 5 + 8 不是一步算出，而是「由左至右、分兩步」— 先算 3 + 5 = 8，再算 8 + 8 = 16。這個「先記住中間答案」的過程，正是工作記憶和運算順序的訓練，也是小一數學科的必考題型。三個數分別用藍、橙、綠色顯示，答完後會逐步展示計算過程，幫小朋友睇清楚每一步。
Chain addition and subtraction extend basic facts within 20: 3 + 5 + 8 isn't one leap, but two steps from left to right — first 3 + 5 = 8, then 8 + 8 = 16. Holding that intermediate answer trains working memory and order of operations, a must-have Primary One skill. The three terms are colour-coded blue, orange and green, and after each answer the calculation is revealed step by step so children can see every move clearly.
鼓勵小朋友說出中間步驟：「3 加 5 等於 8，8 再加 8 等於 16。」講出聲比默算更穩固。答錯時一起找出錯在哪一步 — 是第一步算錯，還是忘記了第三個數？
Encourage your child to say the middle step out loud: "3 plus 5 is 8, then 8 plus 8 is 16." Verbalising beats silent guessing. When they slip, find together which step went wrong — was it the first step, or did they forget the third number?
日常隨口出題：「我哋買了 4 個橙、3 個蘋果、5 隻香蕉，一共幾多個生果？」「18 塊餅，你吃 3 塊、我吃 5 塊，剩幾多塊？」生活化的三個數加減，比工作紙更有效。
Pose questions in daily life: "We bought 4 oranges, 3 apples and 5 bananas — how many fruits in total?" "18 cookies, you eat 3 and I eat 5 — how many are left?" Real-life three-number problems beat worksheets.