How does guessyournumber work

Fourth graders love these tricks! Most of them and even some younger children are also ready to understand how they work and even to learn to make up their own tricks!

Without the high-school notation, what they are learning is the beginnings of algebra! I say Think of a number. Your number is in there. I know that if I tell you to add 3, I can picture that bag and three extras, this way:. When I tell you to double that, I double the quantities in my picture like this:.

Then, when I say subtract 4, I mentally erase 4 of the extras:. From the picture, itself, I can be sure that you can cut that in half , and I picture this:.

The last instruction, subtract your original number , gets rid of the bag! Your answer must be 1. Drew, age 9, kept asking for new tricks, and then started inventing tricks of his own.

Here are two to practice on. Then make up your own tricks. Here are three tricks Drew invented. Draw the pictures to figure out how he can easily figure out your starting number! Click here to learn how to do this trick and to understand how it works.

Algebraic Thinking. Algebraic Thinking Topics: Puzzles. Developing algebraic ideas and language Number tricks are fun for children. Think of a number, do some arithmetic, tell me your result, and I can instantly say what number you started with.

We took a brief detour to establish that Christina guessed forty-two. I told her that the secret number was greater than forty-two and recorded this information on the board. Then Kenny guessed forty-nine. Some students expressed frustration with his guess since they already knew the number was less than forty-five. I stopped briefly to have a talk about maintaining a safe environment. It could have been any of one hundred different numbers, and it took you only eight guesses to get it.

That shows you used a lot of good mathematical thinking. Before I left the class, I called on a pair of students to lead the class in another round of Guess My Number. Guess My Number works equally well with fractions, decimals, or percents. Giving the students some visual tools is essential. Multiply it by 7, 11, and The result will be a six-digit number that repeats the three-digit number. Write "Elephants in Denmark" on a piece of paper. Fold this up and keep it with you.

Next, read the following to your spectator or audience, giving them time to make the necessary calculations: Pick a number between two and nine.

It can be two or it can be nine, or any number in between. Open your iPhone calculator. Type in the first 3 digits of your phone number not your. These are either through complete trickery. Or by using body language reading. Tricks to guess numbers include the Swami Gimmick, simple maths tricks or by using other clever mentalism trickery.

Whereas to guess someones PIN number , this can be achieve using nonverbal signals. Then you can think of the last two digits of the year in which you were born as the answer to the problem 19xx — where 19xx is your birth year.

The Swami pencils. Math Trick. The envelope trick. So what really happened? The pin number guess. Mentalists are very smart individuals who have devised tricks that can make one believe that they actually do know their pin numbers or pass codes or even phone numbers.

Multiply it by Multiply by Add the last 4 numbers. Add the last 4 numbers again. Subtract Tell her to look at the prediction number and when she says it isn't correct ask her to see her phone and the paper.

I will guess your phone number and age in one minute. Video Loading. Have student choose any number and to add 9 to it. It would be easier if they pick small numbers to do this. Have student multiply this number by 2. Subtract 4. Divide the remainder by 2. Subtract the number first chosen. Tell a student to choose any number and add 5 to it. Add 5 with the above answer.

Multiply the answer with Add with the answer. Subtract the your birth year from the result in part 5 example , , etc. Now you will get 3 digit number. The first one is last digit of your mobile …. See Also : Mobile Phone Show details. Classic Elephant Mind Reading Trick. In this trick , here is what you are told to do: Think of any number between 1 and 10 without saying out loud, just think of it. Multiply your secret number by 2. Add 8 …. Think of a number , but don't tell me. Add 55 to it 3.

Add to it 4. Add 34 to it 5. Subtract 42 from it 6. Subtract 89 from it 7. Subtract 23 from it 8. Subtract your number from it Or did we guess it wrong? Tell us in the comments! You were thinking of 2! You were thinking of the number 2, weren't you? Picking this number 2 means you are a very balanced person, you like to look at each conflict from both sides, and reflect back on your life from time to time.