In the Help and Support, Notes for Scientific calculator: Notes In Scientific mode, Calculator is precise to 32 significant digits. Calculator honors operator precedence when calculating in Scientific mode. One must manually enter the correct order in standard mode.

Thanks for the input guys.

There is no problem here. This is how I entered the calculation in both Standard and Scientific modes: Standard: We need to remember that this mode does not include parantheses, so the equation needs to be reorganised to take account of that fact. Also, the memory function might need to be involved. Step 1: 2213720*0.8 MS (Place the result of the calculation in memory) Step 2: 2213720*0.8-1474634.36-4732.2-223747 (Removed parantheses and inverted the signs: x-(y1+y2+y3) is identical to x-y1-y2-y3) Step 3: Result of Step 2 / MR (Divided the result of Step 2 by that of Step 1, which was placed in memory) Step 4: Result of Step 3 * 100 (self-explanatory) Following all that through, we get the following result after Step 4: 3.831923188117738 Scientific: Equation entered as written: ((2213720*0.8)-(1474634.36+4732.2+223747))/(2213720*0.8)*100 This yields 3.8319231881177384673761812695372 As you can see, the results when truncated to the same number of decimal places are identical. The reason for the discrepancy between Windows Calculator (and any other calculator to some degree, for that matter) and doing the calculation by manual longhand is due to how numbers are represented in the internal registers of the calculator. Depending on the numbers involved, and the length of the internal registers (Scientific mode utilises longer length registers when compared to Standard mode), these discrepancies can add up, in particular when irrational numbers e.g. pi and √2 are involved.

Hi, Today i tried to paste the following line into calc.exe ((2213720*0,8) - (1474634,36+4732,2+223747)) / (2213720*0,8)*100 (Remember to replace the decimal sign to match your regoinal settings) In standard mode the result is = 18,96611459443832 In scientific mode the result is = 3,8319231881177384673761812695372 The correct result is 3,8......... Can anoyne explain this behavior and verify the problem?

Hi, there are a lot of issues known in Windopws calculator which mostly see to arise from floating point operations and rounding. And it is known calculator interprets differently in scientific mode as it does in standard. if you search the internet (and microsoft kb) you will find a lot of issues with calc.exe, most of which were never fixed. I would recommend not to use calculator for scientific or otherwise more complex calculations.MCP/MCSA/MCTS/MCITP