mathematics jokes

1.Question: 

Why was the math book screwed up?
Answer:Because it had too many problems!

2.Teacher: "Who can tell me what 7 times 6 is?"

Student: "It's 42!"

Teacher: "Very good! - And who can tell me what 6 times 7 is?"

Same student: "It's 24!"

3."That math prof's marriage is falling apart!"

"No wonder! He's into scientific computing - and she's incalculable!"

                                                                                                                                                          from:aishu