轻松练外语

Unit 2

What's the Missing Number?

sixteen
16
fourteen
14
eleven
11
twelve
12
thirteen
13
fifteen
15
twenty
20
twenty - one
21
missing
缺少的
number
数字
do maths
做算术题
Listen carefully.
仔细听。
What's ... plus / minus ... ?
……加/减……等于……?
... plus / minus ... is ...
……加/减……等于……
Oh, I see.
哦，我知道了。
Sorry, I don't know.
对不起，我不知道。