QUESTION

[corn02]

On a Primary school exam paper.

What four digit number when reveresed is four times the original number?

[Spiritof98]

0000

[mooncatiii]

primary school?! hada long day a work but can't think of this at all?    its probably something simple like  

[Mentalman]

Not a very fair question. I presume they are looking for 0000, but 2178 has the same properties.
Don't know how any kid would figure that easily....

[Orior]

I dont know the answer, but I can tell you how to get it:

1) let x = 9999
2) reverse x to get y
3) if y <> 4x then subtract 1 from x and go back to (2)
4) QED


When you get to step (4) come back and post the answer.

Each cycle should take you about 10 seconds. The probability is that you'll have to do it 5000 times which is nearly 14 hours. Good luck.

[ziggysego]

When did primary school get so complicated?

[Niall Quinn]

2178

On a Primary school exam paper. - no it wasn't.

[corn02]

It was. The mans daughter had it on a test, she is in p7.

[Over the Bar]

On a Primary school exam paper.

primary entrance exam to a maths college more like 

[corn02]

Exactly, an absolutely stupid question to have.

I saw an old 11 plus paper recently, there were some hard questions alright.

[mannix]

I am amazed that you are all so mystified by an easy one like that.Lets start at the bottom

1 + 1 = 2
2 + 2 = 4

AM I GOING TOO FAST?