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30.thirty
40.forty
50.fifty
60.sixty
70.seventy
80.eighty
90.ninety
百 hundred
几十 -ty
21
33
78
100
200
twenty-one
thirty-three
seventy-eight
one /a hundred
two hundred
(整百hundred不加s)
几十几
Let’s chant
How many children are there in the hall?
Twenty, thirty, forty, fifty.
There are fifty children in the hall.
How many teachers are there in the hall?
Sixty, seventy, eighty , ninety.
There are ninety teachers in the hall.
What’s in the classroom?
There is﹨ are...