HOW TO USE MIN,MAX,SUM,AVERAGE FUNCTIONS
STEP 1: use "=" sign
STEP 2: use function SUM
ex: =SUM()
STEP 3: Select the FIRST Cell
STEP 4: Press CTRL+Next Cell
STEP 5: Move your mouse cursor outside of function Sum()
STEP 6: Press ENTER
ex:=Sum(B1;C2)