How to get completely nuts about the number plates

Ever since can remember myself, I was (among other weird things) summing numbers on the number plates, e.g.
274 \;\;78
gives you 1 if you do the following
2+7+4+7+8=28 \to 2+8=10 \to  1+0=1.

A weirdness comes after the observation that no matter the order you always get 1

I found a trick that brought much joy to much childhood – you can always drop a number 9, which, among many things, means you can drop all combinations
1\;8,2\;7,3\;6,4\;5

In this case, you can drop first two digits 2 and 7 straight away, then depending on your arithmetics methods you get number 1 at most two-step.

This method comes from one interesting property of numbers and there is a cool dependency between the number of digits in the numbers and a maximum possible combination to squeeze that one last digit that contains information on the original number.

An example. A plate with
9372
containes  a number 3 because you drop 9 and 7+2.
A long way would be
9+3+7+2=21 \to 2+1=3.

2 Replies to “How to get completely nuts about the number plates”

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