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
c
b
function.
For example, to calculate 2/3 + 1 4/7 , enter the following keystrokes:
2 a
c
b
3 + 1 a
c
b
4 a
c
b
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
c
b
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
2
x
To raise a number to a power other than 2, use the
x
y
function.
For example, to find
3
5
, enter 5
x
y
3 =
(Answer = 125)
Roots:
To find the square root of a number, use
x
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
1
−
(0.45), enter
0.45 2nd sin
(Answer = 26.74
)
