3 ms·
Because adding 9 to any other digit will produce 1 and the other digit - 1. Add these together and you have the original other digit. Because your rule necessit
by meursault334 11y ago
Because adding 9 to any other digit will produce 1 and the other digit - 1. Add these together and you have the original other digit. Because your rule necessitates repeating until you only have 1 digit it doesn't matter when this resolves itself.
For example:
9 6=> 1 5 => 6
Put another way, a nine will bump up the 10s place by one and lower the ones place by 1. These cancel out.
- rokhayakebe 11y agoIs there a simple explanation as to why 9 and 0 share this same property?
- meursault334 11y ago0 + other digit = other digit 9 + other digit = (other digit -1) + 1 = other digit I don't know if there is a good way to quantify this other than it is a basic property of base 10 when you are basically looping around the basis. The other post illuminates on this in that it would be E for hex or 5 for base 6.