Company: Texas Instruments
Type: Scientific – Algebraic
Display: 10 digits or 5 digits with 2 digit exponents
Years: 1995 – 1997 (two editions). I have a the 2nd edition.
Original Cost: $24.95
Datamath page: http://www.datamath.org/Sci/Modern/TI-32EXPLUS_2.htm
* Trigonometry, Logarithms
* Degree and Radian mode
* 1 Variable Statistics
* Backspace key
* Fractions with simplification
* 2 Stored Operations (Macros)
* Random Numbers
* Factorial, Combinations (nCr), Permutations (nPr)
The Explorer Plus dedicates six keys to fractions.
[Unit]: Enter the unit portion of a mixed fraction. A small “u” separates the whole unit and its fraction.
[ / ]: Use this to separate a fraction’s numerator and denominator. This is not the same as the division key [ ÷ ].
[ F <> D]: Change a result from fraction to decimal and vice versa. Changing to a fraction is does not always change the decimal to the fraction
[ Simp ]: Use this key to simplify fractions. I’ll talk about this in a bit.
[ A b/c ]: Change an improper fraction to a mixed fraction.
[ x<> y ]: Exchange entries. This works for operations outside the fraction commands.
Changing to a mixed fraction with the [ A b/c ] key
Example: Change the improper fraction 74/11 to a mixed fraction.
Keystrokes: 74 [ / ] 11 [ A b/c ]
Result: 6 u 8/11
Simplifying a Fraction
If a result has the display “N/D → n/d” on the left side, this means the fraction can be simplified. Fractions can be fully simplified, or you can provide a factor.
Example: Fully simplify 88/55.
Keystrokes: 88 [ / ] 55 [ = ] [Simp] [ = ]
Result: 8 / 5
Press [ x<>y ] to get the factor used to reduce the fraction, in this case, it would be 11.
Example: Reduce the fraction 284/404 by a factor of 2.
Keystrokes: 284 [ / ] 404 [ = ] [Simp] 2 [ = ]
Result: 142 / 202
π and Fractions
In Radians Mode, you can work with fractions involving π. The display will show “Pi”.
Example: π/4 + 3π/6
Keystrokes: [ 2nd ] [ π ] (DR>) until RAD shows in the display
[ π ] [ / ] 4 Display: Pi/4
[ + ] 3 [ π ] [ / ] 6 Display: 3Pi/6
[ = ] Display: 9Pi/12
For the decimal answer, press [ F<>D ] to get 2.35619449.
Other Keys of Interest
The integer division [ INT÷ ] will display the quotient and remainder of the division problems of two integers. The displays the quotient by Q and remainder by R. If you use the result in future calculations, only the integer portion is carried over.
Example: Use the integer division command on 128 ÷ 35
Keystrokes: 128 [ INT÷ ] 35 [ = ]
Result: Q: 3, R: 23
The RAND command on the Explorer Plus has two functions:
RAND by itself: a three digit number between 0.000 and 0.999. Press [ 2nd ] [ = ] (RAND)
Integer Random Number: You can get a random integer from 1 to n (up to 100) by the this keystroke sequence: 1 [ 2nd ] [ = ] (RAND) n [ = ].
Example: Generate a random integer from 1 to 50.
Keystrokes: 1 [ 2nd ] [ = ] (RAND) 50 [ = ]
Results may vary.
You can store simple operations in one of two OP registers, OP1 and OP2. The operations that can be included are +, -, *, ÷, y^x, INT÷, y^(1/x), nCr, nPr, and random numbers.
Example: Store x + 6 in OP1.
[CE/C] (or suitable number) [ + ] 6 [ OP1 ]
11 + 6, 15 + 6, 28 + 6
11 [ OP1 ] Display: 1 17
15 [ OP1 ] Display: 1 21
28 [ OP1 ] Display: 1 34
You can repeat operations.
Clear stored operations by either pressing [ON/AC], which will clear everything, or pressing [2nd] (
I really like the the Explorer Plus and I think it would have a made a great base for the current TI-30X generation. Texas Instruments could have used the TI-40 College (France), which added the rectangular/polar and degrees/degrees-minute-seconds conversion, along with the DIV command (don’t know what that does).
This is a solid calculator for a basic scientific calculator. I like the emphasis on fractions and it contains the basic scientific calculator functions.
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