北京课改版三年级英语上册Unit6 Lesson21微课视频 | MP3朗读 | 同步练习
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Lesson 21
Listen and say
Look at the numbers>看黑板上的这些数字：50, 60, ____, ____, 90.
Who can guess the missing numbers?
谁能猜到空缺处的数字？
It's easy. Fifty plus ten is sixty. So the missing numbers are seventy and eighty.
很简单。五十加十是六十。所以空缺的数字是七十和八十。
One hundred minus ten is ninety.
一百减去十是九十。
Ninety minus ten is eighty.
九十减去十是八十。
So the missing numbers are eighty and seventy.
所以空缺处的数字是八十和七十。
Well done. 做得好。
Listen,look, and learn
Fifty plus ten is sixty. One hundred minus ten is ninety.
五十加十是六十。一百减去十是九十。
Forty plus twenty is sixty. Seventy plus ten is eighty.
四十加二十是六十。七十加十是八十。
Read and write
A plus B is 100. A minus B is 20.
A加上B 是100. A减去B是20.
A is ______, B is ______.
A是 ______, B 是 ______.
A plus B is 90. A minus B is 50.
A加上B 是90. A减去B是50.
A is ______, B is ______.
A是 ______, B 是 ______.
A plus B is 70. A minus B is 10.
A加上B 是70. A减去B是10.
A is ______, B is ______.
A是 ______, B 是 ______.
UNIT 6 I HAVE FIFTY MARKERS
Lesson 21 同步练习
一、拍拍手 , 读读下面的歌谣。
A plus B is 100. A minus B is 20.
A is 60, B is 40.
A plus B is 90. A minus B is 50.
A is 70, B is 20.
A plus B is 70. A minus B is 10.
A is 40, B is 30.
二、读读写写。
三、选择填空。
( )1. Look ________ the numbers on the blackboard.
A. on B. in C. at
( )2. ________ can guess the missing numbers?
A. What B. When C. Who
( )3. Fifty ________ ten is forty.
A. minus B. plus C. and
( )4. Forty ________ twenty is sixty.
A. minu B. plus C. and
( )5. The missing numbers ________ eighty and seventy.
A. is B. are C. am
四、照样子 , 计算。
例: Eighty minus twenty is sixty.
1. I have many ________. I can draw pictures with them.
2. He has three ________.
3. My friend Jim has ________ books.
4. Ten ________ twenty is thirty.
5. Ninety ________ thirty is sixty.
先
思
考
再
看
答
案
参考答案
一、略
二、略
三、 1. C 2. C 3. A 4. B 5. B
四、 1. One hundred minus forty is sixty.
2. Seventy minus twenty is fifty.
3. Ninety plus ten is one hundred.
4. Thirty plus forty is seventy.
5. Forty plus forty is eighty.
五、 1. markers 2. erasers 3. fifty 4. plus 5. minus