人教版小学数学四年级有这样一道题:“每棵树苗16元,买3棵送1棵。一次买3棵,每棵便宜多少钱?”课堂上,读完此题,一位后进生就说:“买3棵送1棵就是便宜了一棵的钱。”心想对其他学生来说这道题应该就更简单了,也就没有多做分析,由学生独立完成。谁知此题的正确率并不高,学生似乎对题意理解非常到位了,却不知怎么总是不能正确解答。大多数学生将16×3÷4=12(元),16-12=4(元)与另一种解法16÷(3+1)=4(元)混在一起。教过的老 PEP fourth grade mathematics has such a problem: “Each sapling 16 yuan, buy 3 to send a tree.A buy 3, how much is cheaper? ” Class, after reading this question, a The student said: “The money to buy a 3 tree is a cheaper one.” "I think this question should be simpler for other students, and there will be no more analysis done independently by the students . Who knows the correctness of this question is not high, the students seem to be very understanding of the intended place, but I do not know why they can not always correct answer. Most students mix 16 × 3 ÷ 4 = 12 (yuan), 16-12 = 4 (yuan) with another solution 16 ÷ (3 + 1) = 4 (yuan). Teach old