Calculator Instructions for TI – 30XA
ON / C Press this key to turn the calculator on or to clear the display
2nd This key is like a shift key and allows you to use the functions above each key in the
pad
Percent: To find 22% of 110, you can either change 22% to a decimal and then
multiply. Or you can use the percent key (located above the digit “2”) as
follows: 110 X 22 2nd 2 = (Answer = 24.2)
Fractions: To do calculations with fractions, use the a
function.
For example, to calculate 2/3 + 1 4/7 , enter the following keystrokes:
2 a
3 + 1 a
4 a
7 = (Answer = 2 5/21)
To change a fraction to a decimal, or a decimal to a fraction, use the
F
D function which is located above the
key.
For example, to change 4/5 to a decimal, enter:
4 a
5 2nd
(Answer = 0.8)
To change a 0.625 to a fraction, enter:
0.625 2nd
(Answer = 5/8)
Powers: To square a number use
To raise a number to a power other than 2, use the
function.
For example, to find
, enter 5
3 = (Answer = 125)
Roots: To find the square root of a number, use
Angles: To change an angle in degrees, minutes and seconds to decimal
degrees, use the DMS
DD function. For example to change 45
37’ 5”
to decimal degrees, enter: 45.3705 2nd + (Answer = 45.618
)
To change an angle in decimal degrees to degrees, minutes and seconds, use the
DD
DMS function. For example, to change 30.45
to degrees, minutes, and
seconds, enter: 30.45 2nd = (Answer = 30
27’)
Trig: To find the trig function of any angle, enter the angle first and then press
the appropriate trig function.
For example to find sin 53
, enter 53 sin (Answer = 0.799)
To find the inverse trig function, enter the ratio first and then press the
inverse trig function. For example, to find sin
(0.45), enter
0.45 2nd sin (Answer = 26.74
)
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