想一想 算一算，本文主要内容关键词为：算一算论文，此文献不代表本站观点，内容供学术参考，文章仅供参考阅读下载。
1.Grandpa has some sheep and some hens.He counts their heads.There are twelve heads.He counts the legs,There are fortylegs.How many sheep and how many hens does Grandpa have? Answer:Grandpa has＿＿sheep and＿＿hens.
2.Tom stands in tile room.There is nothing but two big dogsand five little dogs in it.How many legs are there in the room?
Answer:There are＿＿legs in the room.
3.My mother is five times as old as my younger brother.In 15 years she'll be twice as old.How old is she now?
Answer:She is＿＿years old now.
4.When Mum was 27,Dad was 30.Since Dad is twice as old ashe was then,how old is Mum?
Answer:She is＿＿years old.
5.Two ducks in from of a duck,two ducks behind a duck,andone duck in the middle.How many ducks altogether?
Answer:There are＿＿ducks altogether.