Hello, I'm Li Ang, and I'm today's math teacher. I hope you can support me.

"The things on the paper are very shallow. If you know it, you have to do it." These are two poems by Lu You, a famous patriotic poet in the Song Dynasty. He told us not to always believe in book experience, but to gain true knowledge through personal practice.

Today, I have prepared three topics for you. I named him "three-level intelligence" to see which student can accept my challenge. Prove the truth with actions.

The first level is "blurting out". These are some oral arithmetic problems. See if this classmate can quickly say the correct answer to each question.

160 x400 = 500 x230 = 67+ 1234 = 453+675 = 600÷2 =

135÷87≈786÷ 12≈30x 70 = 453÷29≈300 X60 =

(roll call students to answer, simple evaluation)

The second level is "witty response", which is some common math problems. Who can accept the challenge?

(1) A car traveled at a speed of 30 kilometers per hour for five hours. How many kilometers did a * * * travel? List and say the formulas.

② The school bought 14 football and spent 784 yuan. How much is an ordinary football? List and say the formulas.

(Ask the students' names to answer and give a simple evaluation)

The third level is called "brainstorming". I have prepared some "expanding exercises" that are difficult and need careful consideration. Please accept my challenge.

There is a division formula. The dividend is 428 and the quotient is 5. How many digits must the divisor be? What's the highest? What's the minimum?

..... Please answer, please explain the reason for doing so. ..... Ok, please sit down. (About a classmate, and evaluate)

Please evaluate my performance! (Peer evaluation, thank you. )

Today, I am very happy that everyone has "smartly crossed the three levels" through their own ingenuity. Finally, I send you a poem by Yue Fei, a poet in the Song Dynasty, which says, "Don't wait for leisure, grow old together with sorrow." Thank you!