Press MODE. The second line will say FLOAT and then have the numbers 1-9. If FLOAT is selected, the calculator will not round. If a number is selected, the calculator will round to that number of decimal places. For example, if you wanted to round everything to 3 decimal places, you would select "3".
You can also use the round command. To get to it, press MATH, select NUM and the top and choose the second option, "round(". Type the number and then the decimal place you want to round to, separated by a comma. For example, if you wanted to round 2.569 to 2 decimal places, you would type
round(2.569,2)
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Round to the nearest thousandth: 3,000 Round to the nearest hundredth: 2,600 Round to the nearest tenth: 2,580
It depends on where you want to round it to. It could round up to 1. Or 0.71 or 0.701
Press your Y = button, press X, press second button and then catalog. Press up button to save time and scroll up to > and press enter. then 4. This, >, symbol may be someplace else, but I do not renumber where and all symbols are in the catalog.
in 100ths it would round to 0.300
If one were to round the number 12.45 to another number, there are a couple of options. First, one can round the number to 12.5 or one can round the number to 13.