Rounding
nGeneral Rule - carry out all to four decimal places then round
nAbove .50  round up
n7.3369 rounds up to 7.34
n7.3351 rounds up to 7.34
nBelow .50  round down
n7.3328 rounds down to 7.33
n7.3349 rounds down to 7.33
nExactly at .50  round to an even number.
n7.3350 rounds to 7.34, up a bit
n7.3450 rounds to 7.34, down a bit
n7.3450001 rounds to 7.35, 50001 is slightly higher than .50.
nExponential notation on calculators
n3/524 = .00572519084 =  5.72519084 E-3 in exponential notation
nE-3 signifies that the decimal place is really three places to the left