Keywords: I'm in the fifth grade of Little Game Primary School.

This article is suitable for: the fifth grade of primary school.

Composition source:

This 350-word composition is about the fifth grade of primary school. The title is Math Game: Guess What I am. Everyone is welcome to contribute.

Math Game: Guess what I am.

"Do you believe it or not? I can' see' your hidden numbers. " Mom said to me.

I said, "Really? Let's try one. "

"Yes, I hope you can cooperate with me. First, write a three-digit number. "

I covered the paper tightly with my hand and wrote a number-111,haha, special.

"Switch these three numbers."

Huh? Exchange? I laughed and looked innocent: "Change equals no change." Mom said, "What did you write?" " 1 1 1。" Mom snorted and smiled: "I was teased by you the first time, hey," she pretended to be helpless: "Note that three numbers can't be written the same."

What should I write? Yes, that's it-135.

"Disrupt the order of three numbers."

Yes! 135→ 153 。

Mother went on to say, "Subtract two numbers and cross out any number in the difference."

I did it one by one.

Mother asked, "Now tell me, how many places are missing?"

"Two."

"What's the remaining number?"

" 1"

"So the number you crossed out is 8!" Mom said quietly.

"Don't, mom is clairvoyance? Impossible, peep, impossible, she is so far away from me. Was it an accident? " I said, "No, I have to try another one."

"ok!"

This time, I covered the paper tighter. Write an 823, then the three-digit exchange position is 238, use 823-238=585, cross out 5, and leave 8 and 5. I said, "Mom, there are two numbers left this time, 8 and 5. Can you guess? "

Mom said, "of course, it's 5 yuan!" " "

Oh, my God. It seems that all this is no accident. "Mom, tell me, how did you guess?"

This is how my mother introduced me. Well, I also thought about a magician's addiction. I played it several times in a row and it really worked!

Now, let me reveal the secret: if the difference of subtraction is two digits, you can guess the crossed-out number by subtracting the remaining number from 9. (When the remaining number is 9, the crossed-out number is 9 or 0) If there are three digits, add the remaining two digits; if it is less than 9, subtract the sum from 9; if it is more than 9, subtract the sum from 18 to guess.

How's it going? Isn't it interesting? Play this little game with your family. Come on.-Guess who I am.