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最近我让孩子做一些应用题（6年级），她好多都做不出来，我自己也试了试以为是无解的答案，等我看了答案后才发现，原来是理解错误，有的题目中的fraction是指数量上的，有的是指总额上的，我每次都搞混了，孩子看来也是如此。怎样才能正确理解呢？下面两个例题大家给我看看怎么才能正确理解。 1， Edmund bought some packs of cookies. A small pack of cookies cost $4, a medium pack of cookies cost $6 and a large pack of cookies cost $8. 1/3 of the packs that Edmunds bought were small. He bought 1/5 more medium packs than small packs. The remaining packs were large. If Edmund spent $180 altogether, how many packs of each type did he buy? 2, Mr Jones has some notes. 1/5 of them are two-dollar notes. 3/8 of the rest are ten-dollar notes. The remaining notes are five-dollar notes. The total sum of money he has is $295. How many ten-dollar notes does he have? |
