A third child used the teacher's method of "borrowing a one" and figured 10-8 = 2 to come up with the answer "12," forgetting about the left over "6."
另一個孩子用老師所教的「小數減大數不夠借十」的觀念，將「10-8＝2」，於是答案為「12」，卻忘了加回「原剩下的 6」了。