Lesson V What's the Missing

Number?

Let's talk.

Boys and girls, look here.

What's the missing number?

Sorry, I don't know.

Think it over.Sixteen minus two

is fourteen.Eight minus two is

six.

Oh, I see.The missing

number is eight.

What a clever boy!

What's 90 minus

30?

It's 60.

Magic box

sixty

seventy

eighty

ninety

one hundred

clever

Listen, number and write.