You can't round on a calculator. You do it in your head. 4-1, you round down, 5-9, you round up.
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Round your answer to two decimal places. Example: Your calculator's answer is 2.133334442 You round to: 2.13
Use the float feature found on the mode button. Press mode and then select a number next to FLOAT. If FLOAT is selected, the calculator will not round. Selecting a number next to float will round to that many decimal places.
33.487 is already rounded to three decimal places. if it were 33.4829, which is four decimal places, you would round it to the nearest three DECIMAL places, which would be 33.487. So, the answer to your question is; 33.487 is already rounded to three decimal places.
2229.66 to 0 decimal places = 2230
2356164.38 already has only 2 decimal places, so there is no need to round it.