Question about Texas Instruments TI-30XA Calculator

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I dont understand why I keep getting the wrong exponet in trying to figure out 1500nm divided by 10^9. the answer I get is 1.5 *10^-7 -but the answer is 1.5*10^-6. What am I doing wrong?

I know I must be punching the problem wrong somehow....I an always off by 1 exponent when doing the problem 1500 divided by 10^9. I get 1.5*10^-7. That is wrong. The answer is 1.5*10^-6. What am I doing wrong? Thanks for any help

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  • kakima Nov 06, 2012

    Could you post the exact keystrokes you're using?



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Without knowing exactly what you're doing I can't be sure, but I suspect you're entering the 10^9 as something like 1 0 EE 9 .

1 0 EE 9 gives you 10 * 10^9, which is 10^10. You should be doing this as 1 5 0 0 / 1 EE 9 = .

Posted on Nov 07, 2012

  • deena Nov 08, 2012

    You had the solution....I am so grateful...I have just returned to college after 25 years and I just couldn't figure out what I was doing wrong! Thanks so much!!!



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Posted on Jan 02, 2017


SOURCE: negative answer when squaring a neg number

You must put all negative numbers in Parenthesis otherwise your calculator is not squaring the negative .

Posted on May 05, 2008

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SOURCE: dividing by a negative exponent

(2x3^2) divided by (2x3^(-2))
just make sure to use double parenthesis around the negative exponent so that you get the right answer

Posted on Feb 08, 2009

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SOURCE: I have a TI-30XS Calculator

One solution that you might try is to put the scientific numbers in parentheses. For instance open parenthesis, type in the first scientific notation then close parenthesis, next hit the divide key and then open parenthesis and type in the 2nd number in scientific that you are dividing by and then close parenthesis. Hit enter or =. I'm not sure if this will fix your problem, but it is worth a try.

Posted on Aug 29, 2009

  • 6 Answers

SOURCE: How to use negative exponents on a calculator?

your calculator will never allow you to enter a negative exponent. so heres what you do.Any negative exponent of a number can be reversed and turned into a fraction for example 4^-1=1/4 or 8^-2=2/8=0.25. Hope this helps.

Posted on Sep 21, 2009

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SOURCE: how do i get rid of the exponent?

Do not panic!. Press [MODE]. On first line of MODE set up screen use arrow keys to highlight NORMAL and press [ENTER].
Use down arrow key to go to the line starting with FLOAT, and highlight the number of digits you want your results to display (from 0 to 9). Keep in mind that with 0, all your results will be rounded to the nearest integer. With 9, you have a large stream of digits (not necessarily a more accurate result).

However, if your results are too small or too large, the scientific display format ( with E )will be used regardless of the MODE setup.

Posted on Mar 13, 2010

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2 Answers


5/6 divided by 11/12 is the same as 5/6 times 12/11 which is
10/11. 10 divided by 11 is___________.

Sep 24, 2015 | Cars & Trucks

1 Answer

If may spends 1/5 of her expenses on hotel rooms and 4/10 of her expenses on air fair, how much does she have left

2/5 because 4/10 is also 2/5.
1/5 + 2/5 + 2/5 = 1 or 1 - 1/5 - 2/5 = 2/5.
1 = 5/5 or 10/10 and 1/5 is 2/10 and 3/15 and 4/20 and so on. Multiply both above and under the divider line and you have the same amount.
Please when you try to do your home work like this, don't forget the answer is less important. Understanding how you came to is is the most important thing of learning.

Apr 15, 2015 | Sunburst Fraction Attraction (t02836) for...

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What number divided by 4 equals 10 1/8

The easiest way to figure this out is to reverse the problem.

Since multiplication is the opposite of division you can reorder the problem to get the solution.

The problem: y / 4 = 10.125
Reversed: 10.125 x 4 = y

The answer is 40.5 since 40.5 / 4 = 10.125

Feb 27, 2015 | Office Equipment & Supplies

1 Answer

I thought the answer should be 3

I assume you mean (2x12)/4+10-6 as in your first post. I can understand how you got the wrong answer of 3 in that case but not as you wrote it here.

Multiplication and division get precedence over addition and subtraction.

First, evaluate the expression inside the parentheses: 2x12 is 24.
Then divide by 4 to get 6.
Add 10 to get 16.
Subtract 6 to get 10.

If you incorrectly do addition and subtraction before division then you divide 24 by 4+10-6 (which is 8) and get 3.

Jan 14, 2014 | Computers & Internet

1 Answer

I am trying 0.037 Amps to milliamperes by useing the x10x button i am preety sure i should press 0.037x10-3 but the answer comes up 37/1000000 when the answer should be 37 not sure if the calculators set...

Prefixes such as milli already reflect the corresponding multiplier or divisor. One milliamp is 1/1000th of an Amp, so 37 milliamps = 0.037 of an Amp.

To keep two sides of an equation the same, you need to perform the same operation on each side. In this case, the equation is 37/1000 = 0.037. The "divide by 1000" part of this equation is included in the word "milliamp", hence 37 milliamps = 0.037 Amps.

Another way of looking at it is that a number remains unchanged if you both divide and multiply it by the same number. In this case, changing to milliamps is dividing by 1000, so you need to multiply by 1000 to keep the result unchanged.

You have actually divided by 1000 twice as a result of using x10^-3 as a multiplier when you should have used x10^3

Nov 26, 2011 | Casio fx-300ES Calculator

2 Answers

My TI-83 plus seems to give me the wrong answer if I type in the problem: 1400/(60*24) The answer should be 1, but I keep getting .9722222. I don't understand why it keeps giving me the wrong...

That is the correct answer. 60 multiplied by 24 is 1440. 1400 divided by 1440 is a number slightly smaller than 1.

Are you sure the problem isn't 1440/(60*24)?

Jun 22, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

I have a Casio FX83ES Scientific Calculator and I am trying to work out 1 out of 1700 as a percentage using it. When I type in 1/1700 I get 1 over 1700. I press S<>D and then I get...

1÷1700 expressed as a decimal is 0.000588235, which is 5.882...×10^-4. [NB not 10^4]

To convert this to a percent, remember that "per cent" means "per 100" which also means "divide by 100". To keep the answer correct, if you are dividing by 100 you must also multiply by 100.

The get the answer in percent, you must therefore multiply the previous answer by 100 to get 0.00588235 percent. (or 5.882...×10^-2 percent).

Mar 30, 2011 | Casio FX83ES Scientific Calculator

1 Answer

My problem involves converting in chemistry and im just trying to figure out how to do a problem 0.58 x 6.022 x 10 raised to the 23/ 1. I know how to calculate the problem just cant read the answer a more...

Press the keys:
. 5 8 * 1 2 . 0 1 x^-1 * 6 . 0 2 2 2ND [EE] 2 3 ENTER
and you should get 2.9E22. Do you get something different?

* is the multiply key on the right, between divide and subtract.

x^-1 is on the left, below MATH.

EE is the 2ND function of the , key, just above the 7.

Another way to calculate this is:
. 5 8 / 1 2 . 0 1 * 6 . 0 2 2 2ND [EE] 2 3 ENTER

This should give you the same result.

Mar 10, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

HELP, I can't seem to figure out scientific notations with my Texas Instrument TI-30XA. I've searched for hours on the web. Here's the problem: 7.82 x 10^10 / 63.55 = 1.23 x 10^9. But when I input 7.82 x...

The error comes from the lack of understanding of the meaning of the notation used by the calculator manufacturers.
The [EE] is a "shorthand" notation for times 10 to the power of .
To convince you of it try entering

1[EE]0 [=] this is 1*10^0=1*1=1
1[EE]1 [=] this is 1*10^1=1*10=10
1[EE]2 [=] this is 1*10^2=1*100=100

When you enter 7.82x10[EE]10
you are calculating

Hope it helps.

Nov 12, 2009 | Texas Instruments TI-30XA Calculator

1 Answer

Need help with an assignment for a college paper. need to specify why hypothetical students made the mistakes in division and what the mistakes are and what feedback could be given. the ex. are 2388...

It would seem to me that the answer was found at a grade 3 or 4 level

If you divide 288 by 4 you get 97. Then the 1 is carried to the 2 leaving 12. 12 divided be 4 is 3 leaving a result of 397.

Second one....

217 divided by 5 is 43.4 or 43 with a remainder of 2.

Leaving 5 divided by 5 equaling 1.

Combining the 1 with the 43 with a remainder of 2 bringing you a total of 143 r2

This as mentioned would be at a grade 3 or 4 calculation with no understanding of how to properly divide.

I hope this helps and gives you the "A" you're looking for.

All the best.

Sep 16, 2009 | Computers & Internet

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