清华大学版三年级上册Unit 3 Let’s do math!课前预习课件ppt

这是一份清华大学版三年级上册Unit 3 Let’s do math!课前预习课件ppt，共16页。PPT课件主要包含了Again，twenty，thirty，forty，fifty，sixty，seventy，eighty，ninety，Practice等内容，欢迎下载使用。

20~90的十位数的整数均以后缀-ty结尾 20 twenty 30 thirty 40 frty 50 fifty 60 sixty 70 seventy 80 eighty 90 ninety
There are frty bananas.
My brther tk away ten.
Hw many bananas are left?
40-10=30Frty minus ten is thirty.Thirty bananas are left.
There are fifty apples.
My sister tk away twenty.
Hw many apples are left?
50-20=30Fifty minus twenty is thirty.Thirty apples are left.
There are fifty eggs.
My mther tk away thirty.
Hw many eggs are left?
50-30=20Fifty minus thirty is twenty.Twenty eggs are left.
There are sixty pears.
My father tk away ten.
Hw many pears are left?
60-10=50Sixty minus ten is fifty.Fifty pears are left.
Ninety minus twenty is________.
Eighty minus twenty is________.
One hundred minus twenty is________.
3. 100-20=?
Fifty minus thirty is________.
Sixty minus thirty is________.
Ninety minus frty is________.
回家把今天学到的数字数给爸爸妈妈听。