英语Lesson 21完美版教学课件ppt

这是一份英语Lesson 21完美版教学课件ppt，共22页。PPT课件主要包含了plus，blackboard，seventy ，eighty，seventy，ninety，minus，Well done等内容，欢迎下载使用。

Yu have s many cllectins. We need t learn smething abut additin and subtractin. Then yu can cllect mre and mre.
My cllectins
What are they talking abut?
It’s easy. Fifty ____ten is sixty. S the missing numbers are _______and ___________.
Lk at the numbers n the ____________: 50, 60, ____, ____, 90. Wh can guess the missing numbers?
Lk at the numbers n the blackbard:
S the missing numbers are seventy and eighty.
Fifty plus ten is sixty.
Ninety minus ten is ______.
____________minus ten is ___________.
One hundred
One hundred minus ten is ninety.
S the missing numbers are eighty and seventy.
What des Lala ask?
Wh can guess the missing numbers?
What are the missing numbers?
Seventy and eighty.
Lk at the numbers n the blackbard: 50, 60, ____, ____, 90. Wh can guess the missing numbers?
It’s easy. Fifty plus ten is sixty. S the missing numbers are seventy and eighty.
Ninety minus ten is eighty.
Lala: Lk at the numbers n the blackbard: 50, 60, ____, ____, 90. Wh can guess the missing numbers?Baba: It’s easy. Fifty plus ten is sixty. S the missing numbers are seventy and eighty.
Baba: One hundred minus ten is ninety.By: Ninety minus ten is eighty.Lingling: S the missing numbers are eighty and seventy.Lala: Well dne!
Frty plus twenty is sixty.
Seventy plus ten is eighty.
… plus … is …. … minus … is ….