My mistake. I didn't notice the 'round up' part.

CLEAR

FOR i=8359 TO 8371
  ? i, RoundupTo10(i)
ENDFOR

FUNCTION RoundupTo10(tnValue)
RETURN ROUND(tnValue + 4.9,-1)

>Round() won't work for the first example - Ceiling is better - but works different for negative numbers