Why six is afraid of seven?

Why six is afraid of seven?

Because seven eight nine.

Why did the teacher put the lights on?

Because the class was so dim!

Teacher: What are you reading?

Pupil: I dunno!

Teacher: But you are reading aloud!

Pupil: Yeah, but I'm not listening!

Who invented fractions?

Henry the Eighth!

Teacher: Make up a sentence using the word "lettuce".

Pupils: Let us out of school early!