The "different" behaviour occurs at the mid-point between 10ths i.e.
10.05, 10.15, 10.25, etc. This is where "throwing to the odd occurs (if
you are measuring to the nearest 10th).
I can't remember either what the "name" of this rounding is

It is called "rounding half to odd", not surprisingly!

See http://en.wikipedia.org/wiki/Rounding#Round_half_to_odd

--
Freddie
Bayston Hill
Shropshire
102m AMSL
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