第三单元

Unit 3

Cloth art interest group -- fraction division

三 布艺兴趣小组——分数除法

Lesson 1

The Cloth Art Group used 9/10 meters of cloth to make vests for the monkeys, It can make 3 pieces; If you use 5/6 meters of fabric to make pants, you can make 2 pairs.

布艺兴趣小组用9/10米布料给小猴做背心，可以做3件；用5/6米布料做裤子，可以做2条。

What questions can you ask?

你能提出什么问题?

Cooperative exploration

合作探索

1. How many meters of cloth is needed to make a vest?

1. 做一件背心需要布料多少米？

Nine tenth divided by three equals to _____ (meters)

9/10 ÷3＝_____(米)

2. How many meters of cloth is needed to make a pair of trousers?

2. 做一件裤子需要布料多少米？

Five sixths divided by two equals to ______(meters)

5/6÷2＝_______(米)

Think about it. How do you divide a fraction by an integer?

想一想，怎样计算分数除以整数？

Lesson 2

Cloth interest group students need to use 2 meters of cloth to make a letter bag.A small letter bag needs 1/5 meter, and a large letter bag needs 2/5 meter.

布艺兴趣小组的同学要用2米布做书信袋。一个小书信袋需要1/5米，一个大书信袋需要2/5米。

Students in the interest group have to use 4/5 meters of cloth to make a dress for the doll. A dress needs 4/25 meters.

兴趣小组的同学要用4/5米布给洋娃娃做裙子，一条裙子需要4/25米。

What questions can you ask?

你能提出什么问题？

Cooperative exploration

合作探索

1. How many small letter bags can 1.2 meters of cloth be made?

1. 2米布可以做多少个小书信袋？

Two divided by one half equals to ______(PCS)

2÷1/5＝______(个)

Let me draw it.

我画图分析。

1 meter has 5 1/5 meters, so 1 meter of cloth can make 5 small letter bags, 2 meters of cloth can make 2 times 5 is 10 small letter bags.

1米里面有5个1/5米，也就是1米布能做5个小书信袋，2米布能做2×5＝10个小书信袋。

Two divided one half equals to two times five equals to ten

2÷1/5＝2×5＝10(个)

2. How many big letter bags can 2.2 meters of cloth make?

3. 2米布可以做多少个大书信袋？

Two divided by two fifths equals to _____

2÷2/5＝_______(个)

Summary 2÷1/5 and 2÷2/5, what do you find?

总结2÷1/5和2÷2/5的计算方法，你有什么发现？

Think about it. How do you calculate an integer divided by a fraction?

想一想，怎样计算整数除以分数？

4. How many skirts can be made from 4/5 meters of cloth?

4.4/5米布可以做几条裙子？

Four fifths divided by four twenty-fifth(pieces)

4/5÷4/25＝_______(条)

Think about it. How do you divide fractions?

想一想，怎样计算分数除法？

Lesson 3

The first cloth art interest group made 8 bows and completed 2/5 of the group's project.

第一布艺兴趣小组做了8个蝴蝶结，完成了本组计划的2/5。

What questions can you ask?

你能提出什么问题？

Cooperative exploration

合作探索

1. How many bows does team 1 plan to make?

1. 第一小组计划做多少个蝴蝶结？

Let me draw it.

我画图分析。

The number of planned times two fifths is the number of done

计划做的个数×2/5＝已做的个数

Solution: Let's say the first team plans to make x bows.

解：设第一小组计划做x个蝴蝶结。

X times two fifth equals to eight. X is 20.

x×2/5＝8

x＝20

Answer: The first fabric interest group plans to make 20 bows.

答：第一布艺兴趣小组计划做20个蝴蝶结。

2. There are 6 people in Group 2, which is 3/4 of the number of people in Group 1.

2. 第二小组有6人，是第一小组人数的3/4.第一小组有多少人？

The number of people in group 1 times 3/4 is equal to the number in group 2

第一小组的人数×3/4＝第二小组的人数

Solution: Let's say the first group has x people.

解：设第一小组有x人。

X times three fourths equals to six.  X is eight.

x×3/4＝6

x＝8

Answer: There are eight people in the first group.

答：第一小组有8人。