20以內進位加法是小一數學的第一道大關，核心技巧是「湊十法」：例如 8+5，先把5拆成2+3，8+2湊成10，再加3等於13。遊戲用餵飽曲奇怪獸的情境，讓小朋友在不知不覺間反覆練習這個心算策略 — 這正是小一面試與日常課業最常見的題型。
Carrying addition within 20 is the first big hurdle of Primary One maths, and the key strategy is "make ten": for 8+5, split 5 into 2+3, make 10 with 8+2, then add 3 to get 13. Feeding the cookie monster turns this essential drill into play — and it is one of the most common question types in Primary One interviews and schoolwork.
問小朋友：「8加5，可不可以先湊到10？」引導他說出「8+2=10，10+3=13」的完整思路。如果他還在逐隻手指數，不要緊 — 可以畫一個十格框（ten frame）讓他看著擺，視覺化之後，策略自然記牢。
Ask: "For 8+5, can we make 10 first?" Guide your child to say the full thinking: "8+2=10, 10+3=13." If they are still counting finger by finger, that's fine — draw a ten frame for them to place items on. Once they can see it, the strategy sticks.
用積木或硬幣玩「湊十」：拿出8粒，問要加多少粒才夠10？熟練之後，見到9就想到1、見到8就想到2 — 這種直覺是所有進位加法的基礎。
Play "make ten" with blocks or coins: take out 8 and ask how many more make 10. Once fluent, seeing 9 reminds them of 1 and seeing 8 reminds them of 2 — this instinct underpins all carrying addition.