How do you round on Ti-84?

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)