1、UNIT 6 I HAVE FIFTY MARKERS Lesson 21 同步练习同步练习 一、拍拍手一、拍拍手,读读下面的歌谣。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。二、读读写写。 三、选择填空。三、选择填空。 ( )1. Look _ the numbers on the blackboar
2、d. 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、照样子四、照样子, 计算。计算。 例: Eighty minus twenty is
3、 sixty. 1. _ 2. _ 3. _ 4. _ 5. _ 五、五、从方框中选出合适的词填空。从方框中选出合适的词填空。 minus fifty markers plus erasers 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. 参考答案参考答案 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
