 Best Sellers | | Home Texas Instruments TI-30XIIB Scientific Calculator | |
|  | |  | | | Texas Instruments TI-30XIIB Scientific Calculator | | | | | | | | | | SKU:
DHTI30XIIB | | Availability:
Out of stock | | |
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| | Features | +/- Switch Key - NoAmortization - NoBackspace Key - YesBase Number Calculations - YesBond Calculations - No
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| | Description | 2 line battery powered scientific calculator showing entry and results. Recall and edit previous entries. Statistics, fractions, 5 memories, polar and rectangular coordinates. Protective cover included. 7"w x 10"d x 1"h. TEXTI30XIIB TEX-TI30XIIB 033317198719 3331719871 | |
| | Product Details | | Product Weight: | 0.0 pounds | | Package Length: | 9.37 inches | | Package Width: | 6.69 inches | | Package Height: | 1.18 inches | | Package Weight: | 0.49 pounds | | Average Customer Rating: |  based on 2 reviews |
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| | Customer Reviews | Average Customer Review: ( 2 customer reviews )
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Most Helpful Customer Reviews
1 of 1 found the following review helpful:
 This calculator is only "buggy" if you don't know the rules of math. Apr 17, 2010
By B. Farrow
Texas Instruments' TI-30X-IIB and IIS series calculators are brilliant and intuitive. Users can think linearly and type into this calculator as they think. For example, if a student wants to find the square root of two, they first hit the square root function, then 2, then Enter, as opposed to typing it backwards (first 2, then the square root key). These calculators have a wide range of fraction functions that make working with mixed numbers and improper fractions a breeze. I recommend these calculators to all of my students who do not yet need to graph.
A previous reviewer mentioned a "bug" where negative numbers must have parentheses around them in order to be taken to exponents correctly. However, this is not a bug, because this follows the standard rules of math. This calculator, like all good ones, follows the order of operations, or PEMDAS (parentheses, exponents, multiplication and division, addition and subtraction) which means that exponents are to be solved before multiplication. Negative signs are supposed to be treated like multiplying a number by negative one. So if "-5^2" is typed into the calculator, the calculator will square the 5 (doing exponents first), and then multiply the answer by the negative 1, giving an answer of -25. In order to correctly square -5, you must put the -5 in parentheses in order to multiply -the 1 by the 5 before the number is squared: "(-5)^2".
This is definitely something that a user should be taught before using this calculator; however, it is not a bug because it is doing exactly what it is supposed to. A calculator should not have to break the rules of math to cater to those who do not know them.
0 of 1 found the following review helpful:
 It doesn't do squares correctly Nov 07, 2008
By Edward McQue
Beware. If you try to enter a negative number and square it (hit the - number sign, enter a number like 3 and then hit the X2 button) it will show an answer of -9 (for my -3 squared example). It, obviously, should be positive 9. I called TI to report this bug and the lady said you have to put parenthesis around the - number and it works fine and it's not a bug. I'm a software developer, that is a bug (undocumented feature). It also seems to work if you do minus sign, 3, = and then x2. It's not intuitive, though.
The calculator seems to work otherwise and many in my daughter's class have this model. She brought me her homework and said it didn't look right. She was correct because the squares of the negatives were wrong!
My sharp scientific calculator calculates squares absolutely correctly.
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