1、-小学资源网（http:/） 投稿电话：010-52203411 QQ:2355394508-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 i s 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
2、on the blackboard.-小学资源网（http:/） 投稿电话：010-52203411 QQ:2355394508-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来源:学科网( )5. The missing numbers _ eighty and seventy.A.
3、is B. are C. am四、照样子, 计算。例: Eight y minus twenty is sixty.1. _ 来源:Zxxk.Com2. _-小学资源网（http:/） 投稿电话：010-52203411 QQ:2355394508-3. _4. _5. _五、从方框中选出合适的词填空。minus fifty markers plus erasers1. I have many _. I can draw pictures with them.2. He has three _.3. My friend Jim has _ books.4. Ten _ twenty is th
4、irty.来源:Z。xx。k.Com5. Ninety _ thirty is sixty.-小学资源网（http:/） 投稿电话：010-52203411 QQ:2355394508-参 考答案一、略二、略来源:学科网三、1. C 2. C 3. A 4. B 5. B四、1. One hundred minus forty is sixty.2. Seventy minus twenty is fifty.来源:学| 科|网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
