Ask someone to write a number, say a
5-digit number. (Can be a 2-digit.....3-digit.....4-digit....etc...…).

Suppose the number written is 78513.

Now, tell the person that you are each
going to write down 2 more 5 digit numbers and add them, but before you do, you
are going to write down the answer on a piece of paper and keep it folded.

- thus 78513 become 278511 for the answer.You obtain the answer by subtracting 2 from the above number and placing a 2 before the first digit

Now ask the person to write two more 5-digits
number down, either at once or in succession with you. Either way, he must go
before you.

Suppose he writes 27569.

So you now have...

78513

27569

27569

Now you write a five-digit number below
it in such a way that each digit is 9 minus digit above. You now have...

78513

27569

72430

27569

72430

Then if he adds 45732, you add below it
54267. Note that you decided the number by subtracting each of his digits from
9.

78513

27569

72430

45732

54267

27569

72430

45732

54267

Now, ask him to add all the number and
he gets 278511.

Show him the number which you had
written as the answer to this addition earlier in the folded paper and … you're
a hero!

Another example:

Suppose the number written is 746. You write 2744 on a piece of paper for the answer and fold it up.

Original
number
746

Their first
number 325

Your first
number 674
(999-325)

Their second
number 841

Your second
number

__158__(999-841)
Total is

**2744**
They unfold the paper and you're a
hero!

make math more interesting.....

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ReplyDeleteMast

ReplyDeleteWhat if the digits of number is not same ??

ReplyDelete