Lala Lala One day, Xiaoding will go to the Math Castle to meet the Math King. Hardly had he reached the gate of the kingdom of mathematics when several guards blocked his way. A guard said to him, "What are you doing here?" Xiaoding replied, "I went to town to see the king of mathematics." The guard went on to say, "if you want to go in and see the king, you have to go through several customs first." Have the courage to accept the challenge? " Xiaoding patted his chest and said loudly, "No problem." "good! Please listen to the question: one hat 16 yuan, buy three hats 1. Xiaoming buys three hats at a time. How much cheaper is each hat? " Xiaoding used his brain and rolled his eyes several times, and finally found the answer: 16×3=48 (yuan) 48÷(3+ 1)= 12 (yuan)16-12. "You are amazing! Is there an easier way? " "Of course. Because four * * * are cheap 16 yuan, so: 16÷4=4 (yuan), each is cheap in 4 yuan. " "Congratulations on your success." The guard gave a thumbs-up, opened the door and let him enter the kingdom of mathematics.

Xiaoding walked the streets in the mathematics kingdom and finally found the castle. He was just about to go in when several guards blocked the way. "Do you want to go in and see the king?" Asked the guard. Xiaoding nodded his head. The guard said, "Then you must break through me. Listen to the question: A rectangular board has four corners. If you saw off a corner, how many corners were left? " "Ha, this problem doesn't bother me. Graphics are my strength. " Xiaoding was secretly pleased. "Five!" Xiaoding answered very simply. "The answer is correct. Success! " The doorman quickly opened the door for Xiaoding, and Xiaoding met the king of mathematics as he wished.