# How to use a TI 30x iib calculator

Written by j.t. barett
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The Texas Instruments 30X IIB is an mid-level, hand-held scientific calculator suitable for high school and college students and technical professionals. It an perform functions like standard arithmetic, trigonometry, hyperbolics, logarithmns and statistics. It can work in decimal degrees, radians, grads or degree-minute-second mode. The two-line display helps you keep track of longer calculations. You can enter non-integers as fractions or decimals. As with other sophisticated models, many keys have two functions. The calculator runs on either battery or solar power.

Skill level:
Easy

### Things you need

• TI 30X IIB calculator

## Instructions

1. 1

Press the "ON" button, located at the bottom left, to turn the calculator on.

2. 2

Press the keys: 4 X 20 =. You should see 80 displayed as a result. Press 2 X ( 5 + 7 ) =. The calculator should display 24.

3. 3

Press the "DRG" key and select degrees. Press 4 5 TAN ) = to take the tangent of 45 degrees. The calculator should display 1. Press 2 7 0 SIN ) = to take the sine of a 270 degree angle. You should see a --1 as a result. Press .789 2nd SIN ) = to see the arcsine of .789.

4. 4

Press "2nd [STAT]" and "CLRDATA" to clear out the calculator's statistics. Press "2nd [STAT] 1-VAR" and "ENTER" to set the calculator for one-variable statistics. Press "DATA." Input a series of data points by pressing "1 ENTER 2 ENTER 3 ENTER." Press the "STATVAR" key and select the x with the bar over it, indicating average or mean. Press "ENTER" again and see two on the display.

5. 5

Look for the key that reads "A b/c." This key lets you input fractions. Press "3 A b/c 4 ENTER + 1 A b/c 2 ENTER" and see 1 ¼ on the display.

#### Tips and warnings

• Turn the calculator off by pressing "2nd" and "ON." It will turn itself off automatically after five minutes if you don't touch a key.

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