第七单元

Unit seven

Bizarre cloned cow - addition and subtraction of decimals

奇异的克隆牛——小数的加减法

Lesson One

第一课

When I was born, my chest size was 0.77 meters

出生时，我的胸围是0.77米。

My chest size at birth was 0.03 meters larger than Jian Jian's.

我出生时的胸围比健健多0.03米。

What questions can you ask?

你能提出什么问题？

How many meters was the chest circumference when zhuang zhuang was born?

1.壮壮出生时的胸围是多少米？

Seven point seven plus three point three is equal to -- meters

0.77+0.03= ——米

Can we get rid of this zero?

这个0可以去掉吗？

Seven 0.01's plus three 0.01's is...

7个0.01加上三个0.01是…

How much more did zhuang zhuang weigh at birth than jian jian?

2. “壮壮”出生时的体重比“健健”长多少？

0.76 minus 0.72 is equal to -- meters

0.76-0.72=——米

Can you calculate 3.75+3.4 and 1.3-1.25?

你会计算3.75+3.4和1.3-1.25吗？

Three point seven five plus three point four equals

3.75+3.4=——

Which algorithm is correct? Why is that?

哪一种算法正确？为什么？

Think about it: what should we pay attention to when adding and subtracting decimals?想一想：计算小数加、减法要注意什么？

Lesson Two

第二课

I was born.

我出生了

The cloned cow "Bei Bei" was born.

克隆牛“蓓蓓”出生了。

Today I am a full moon, and my body length has increased by 0.1 meters since I was born.

今天我满月，我的体长比出生时增加了0.1米。

At the end of 100 days, my body length is 0.98 meters, 0.22 meters longer than at the full moon.

过百天了，我的体长是0.98米，比满月时增加了0.22米。

What questions can you ask?

你能提出什么问题？

How many meters was Hailey's body when she was born?

1.蓓蓓出生时的体长是多少米？

One point nine eight minus one point two two minus one is one point six meters

0.98-0.22-0.1=0.66米。

A: How many meters was Hailey's body when she was born?

答：蓓蓓出生时的体长是多少米？

How many meters has Hailey grown at 100 days since she was born?

2.“蓓蓓”百天时的身高比出生时增加了多少米？

One point eighteen plus one point sixteen minus one point seventy-eight equals one point nineteen

0.81+0.16-0.78=0.19（米）

Can you calculate the following problems?

你会计算下面的题目吗？

7.65+3.72+6.35+6.28

=（7.65+6.35）+（3.72+6.28）

=14+10

=24

I found that the same laws applied to addition of integers also apply to addition of decimals.

我发现整数加法的运算律也只也适用于小数加法。

Wisdom Plaza

智慧广场

The following is the record of class one, grade four students participating in social practice activities during the holiday.

下面是四年级一班同学假期参加社会实践活动的情况记录。

little reporter                     Small traffic police

小记者                          小交警             

李明    王强                      李明    王强

赵刚    张小帅                    赵刚    张小帅

方伟   王东方                     于平丽  丁娜

周晓丽  赵云                     徐大文    刘乐乐     

孙亮    陈红                      毛小宁

合计：10人                         合计：9人

How many people participate in the social practice?

参加社会实践活动的一共有几人？

If 5 people participate in both activities, how many people participate in the social practice?

如果两项活动都参加的有5人，参加社会实践活动的一共有几人？

What if there are 6, 7, 8 or 9 people participating in both activities?

如果两项活动都参加的有6人，7人，8人或9人呢？

I find that when you have duplicates like this, you should subtract the duplicates from the sum.

我发现像这样两部分有重复时，应从和中减去重复的部分。