You have to hit the equals (=) sign to complete a calculation using these symbols. Use these functions the same way you would on a basic calculator. For example, to find 12/4, enter 12÷4={\displaystyle 12\div 4=}.
For example, if your problem is 2 - 4 × -3 ÷ 2, you can type 2−4×−3÷2={\displaystyle 2-4\times -3\div 2=}, and the calculator will automatically do the order of operations for you.
Hit the beginning parentheses before you hit your first number, and hit the ending parentheses after you hit your last number. The calculator will complete that calculation before you enter your next functions. If you need, you can also nest parentheses, though be sure that you can keep track of them.
For the TI-30X IIS, one of the 2nd functions is to turn off the calculator. Simply press 2nd ON{\displaystyle \mathrm {2nd} \ \mathrm {ON} }.
For example, to evaluate 4/5 + 6/7, type in 4÷5+6÷7={\displaystyle 4\div 5+6\div 7=} to get approximately 1. 657. Use parentheses for more complex operations. To convert back to fractions, use 2nd PRB{\displaystyle \mathrm {2nd} \ \mathrm {PRB} } to get the answer in mixed fractions.
For example, to square the number 12, type 12 x2={\displaystyle 12\ x^{2}=}. To find powers of any number, use the ∧{\displaystyle \wedge } key. For example, type 3∧5={\displaystyle 3\wedge 5=} to get 243.
To find the square root of 9, type 2nd x2 9={\displaystyle \mathrm {2nd} \ x^{2}\ 9=}.
For example, to find the logarithm base 10 of 100, simply type LOG 100={\displaystyle \mathrm {LOG} \ 100=}.
For example, to find the natural log of e, type in LN 2nd LN 1={\displaystyle \mathrm {LN} \ \mathrm {2nd} \ \mathrm {LN} \ 1=}.
For example, if you wanted to find the sine of 60 degrees, make sure that you are in degree mode by checking the lower right of the display. Then, type SIN 60={\displaystyle \mathrm {SIN} \ 60=}.
For example, to find the reciprocal of 3, type 3 x−1={\displaystyle 3\ x^{-1}=}.
