Question about Texas Instruments TI-89 Calculator

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Can't insert anything in between numbers or equations.

If i type in anything like 564544, but i forget to put a divide for multiply, i cannot go back and just insert it in. I have to go and put a divide and it erases the 5 like this 564/44. it just happened yesterday. did i acidentally change a setting?

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Re: Can't insert anything in between numbers or equations. - Texas Instruments TI-89 Calculator Calculators

Did you try 2nd delete?

Posted on Oct 17, 2007

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How to divide 1 2/3 by 3

First make 1 2/3 into a mixed fraction and then divide it by 3.
To make 1 2/3 into a mixed fraction, multiply the whole number, in this case, 1, by the denominator (the bottom number) and then add the numerator (the top number). Thus, we get (1*3+2)/3 or 5/3. Now we have to take 5/3 and divide it by 3. I was taught that in this case, dividing by 3 is the same as multiplying by 1/3. 5/3 x 1/3 = 5/9.

If you have access to a calculator you can always check this. On the calculator, do 2 divided by 3 and add 1. Now take that answer and divide by 3. Write down this answer. Now take 5 and divide by 9. Write down this answer. They should be the same.

Good luck.


Mar 17, 2015 | Calculators

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How does dividing mixed numbers compare with dividing fractions?

This may not be what you want, but I turn the mixed number into a fraction. Say 5 1/2, you multiply the whole number (5) by the denominator for the fraction (2), then add the numerator. So you have 5X2+1. That is the new numerator, it goes over the denominator. This gives you 11/2. To check it divide the numerator by the denominator. 2 into 11 gives you 5 (Rem) 1. 1 is the numerator now and it goes over the denomerator. 5 1/2.
I know it sounds like a lot, but try about ten or so, it becomes 2nd nature. You can make it all into decimal, 5 1/2 becomes 5.5, but now you have to put more numbers into the equation.
This is true. I had a math teacher ask me if he had to cut down a tree so I'd have enough scratch paper.

Jan 26, 2015 | Calculators

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Where do I find a Manual for scientific calculator BD-6108? If I multiply or add only the numbers I put in end up on the screen but it doesn't add or multiply them. There is an "a" at the top of the

Your calculator may have a solver of equations, which you activated. It is prompting you to enter the coefficient a. Is there a question mark after the a?.

Oct 02, 2014 | Calculators

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Complex matrix

Is it complex or matrix? You can have only one mode at a time.What kind of equations? The solve function uses real-valued equations.
Complex numbers: You can add, subtract, multiply and divide. You can convert a number from rectangular to polar forms and vice-versa; you can calculate the absolute value of a complex number, or a conjugate.
All the operations are done in the Mode CMPLX.

Feb 04, 2014 | Casio FX991MS Scientific Calculator

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How to divide mixed numbers

Since you didn't give any mixed numbers, I'll first divide one fraction by the other.

1/3 divided by 13/9 is the same as 1/3 multiplied by 9/13. Multiply 1 by 9 to get 9, multiply 3 by 13 to get 39. The result is 9/39, which reduces to 3/13.

Oct 17, 2013 | Calculators

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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

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I am dividing a 3*1 matrix with a 3*3 matrix with numbers in polar format and it gives me the error data type error.

You'll get the same error if you try to divide two matrices with real numbers. The TI-89 doesn't allow you to divide a matrix by another. However, you can multiply a matrix by the reciprocal of the other.

For example, to calculate A/B, calculate instead A*B^-1 . Makes sure you use the (-) key just to the right of the decimal point key to put in the negative sign before the "1".

Sep 10, 2011 | Texas Instruments TI-89 Calculator

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How do I enter the following equation: 10 x 2 to the 36th power?

Almost exactly the way you wrote it. Press
1 0 * 2 y^x 3 6 =

* is the multiply key just below the divide key, y^x is the key just above the divide key.

Jul 14, 2011 | Texas Instruments TI-30XA Calculator

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Compound interest formula: A = P(1 + r)n if a=2000, p = 1000, r = 12%, how do I solve for n?

Using algebra, restructure the equation for n= as follows:

Divide both sides by n leaving a/n = P(1+r)

Inverse the equation: n/a= 1/[P(1+r)]

Multiply both sides by a: n=a/[P(1+r)]

Mar 07, 2011 | Calculators

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