You can't really type fractions, but you can use the divide function to create the fraction line, and imitate it in a way.
I need help in how to convert fractions to decimals
How to add fractions on a texas instruments TI-81
85% = 85/100 or 17/20
You type in, for example, 4/5, or the number 4, then division , then the number 5. You may or may not want to put it in brackets eg. (4/5) You should only need to if you were raising it to a power eg. (4/5)^2
The TI-85 was the second graphing calculator made by Texas Instruments. (The first was the TI-81). The TI-84 is a much newer version and has more functionality and memory. The only real advantage that the TI-85 has over the TI-84 is that it costs less. As far as where you are allowed to use the calculator, almost every test or class that allows a TI-85 will allow a TI-84 as well. The TI-84 is a much better investment. (If the TI-84 is too expensive, look into getting a TI-83. This model is also newer than the TI-85.)
51/85 = 3/5
The TI-82 was designed and introduced in 1993, as a replacement for the TI-81, and as a more user friendly version of the TI-85.
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The LCD for these fractions is 48,620.
30/85 = 6/17 in its simplest form
There are an infinite number of fractions equal to 65/85, which is too many to list here. The simplest form is 13/17.
With the latest TI-84 updates, you can work with fractions as actual fractions - not operators or decimals. To insert a fraction press Alpha > F1 > 1:n/d. Enter a couple of numbers, press the "+" sign, do it again, press enter, and you will get your answer!