I learnt something from our visit to the Pusat Sains Negara at Bukit Damansara yesterday.
A roundabout number is a number that when you multiply by something, the numbers in it are in the product. An example of a roundabout number is 142857. So,
if multiplied by 2: 142857 x 2 = 285714
if multiplied by 3: 142857 x 3 = 428571
Try multiplying by other numbers. Fascinating, isn't it?
A roundabout number is a number that when you multiply by something, the numbers in it are in the product. An example of a roundabout number is 142857. So,
if multiplied by 2: 142857 x 2 = 285714
if multiplied by 3: 142857 x 3 = 428571
Try multiplying by other numbers. Fascinating, isn't it?
A puzzle:
Draw 4 straight lines to connect all the dots.
[Scroll down for answer.]
Answer:
2 comments:
i tried multiplying - only works up to 6. but you're right - it is fascinating.
Hi YP
It seems to work for all numbers except for multiples of 7. Even for bigger numbers, you can detect a pattern (ie for products that have more than 6 digits). Try with an Excel spreadsheet - I find it intriguing!
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