Question about Casio FX-115ES Scientific Calculator

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I'm getting answers in fractions when multiplying decimal numbers like 5.5x3.5=77/4 instead of 19.25. Can someone help with this, I have a test tomorrow and I need to figure out what's wrong with the settings.

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In the default MthIO mode the calculator will always try to show exact or symbolic results. You can convert a single result to decimal by pressing the S--D key. If you want all results to be in decimal, press SHIFT MODE 2 to switch to the LineIO mode.

Posted on Nov 11, 2010

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What fraction is equivalent to 2/3


4/6
6/9
8/12
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etc. Just keep multiplying by the same number on both sides.

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Find fractional notation for the ratio of 335 to 547.


write as decimal over one as fraction.
multiply top and bottom for number of decimal places by 10^(number of decimal places) to eliminate decimal.
Find the greatest common factor (gcf) for both numerator and denominator and divide both by this number in this case 2.
Simplify result.

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Convert decimal fraction to binary


None of these solutions answer his question. When converting a fraction or any number with decimal places to Binary, the TI-89 gives "Error: Domain error." For example, entering .6875 [2ND][MATH][BASE][BIN] does not work. I haven't found a way to do it with built in functions. In order to do these types of conversions, I use the following method.

Convert: 0.6875 to Binary
- left of decimal is a 0, so write down a 0, then a decimal point: (0.)
- multiply .6875 x 2 = 1.375 left of decimal is 1, write a 1: (0.1)
- drop the 1 and multiply .375 x 2 = .75 left of decimal is 0. write a 0: (0.10)
- multiply .75 x 2 = 1.5 left of decimal is 1, write a 1: (0.101)

- drop the 1, multiple .5 x 2 = 1. left of decimal is 1, write a 1: (0.1011).
- since there is no more fraction, the final answer is (0.1011). Hope this helps.

Jan 27, 2012 | Texas Instruments TI-89 Calculator

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Hi i have a TI-34-II and i need someone to tel me how to change a fraction into a percent and how to chance a fraction into a decimal. please help!!


One can express percentages as fractions. Say you have 60% and you want to change this into a fraction. you can also express this as 60/100 because all percentages are are parts of 100. So to change a fraction into a percent you would just convert the fraction into a decimal by dividing (3/4 = .75). Then to get the percentage you just multiply the decimal by 100 to get the percent. (75x100=75%

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Casio fx-300ES Default answer readout?


Hello,

Generally, MathIO gives results in fractions or radicals. But sometimes it does not. I tried multiplying or dividing fractions or radicals by integer numbers, and once in while I got a decimal result and was unable to cast it into a fraction or a radical. I was not able to find the pattern.
In lineIO you only get decimal results.
What can one tell you that you cannot determine for yourself? If you appreciate the functionalities of the MathIO, it seems like an insignificant price to pay to press ONE button to switch between displays. It needs to be done ONLY once, for the last result one wants to record.
Your calculator, Your rules. But sometimes one cannot eat the cake and have it too.

Oct 20, 2009 | Casio fx-300ES Calculator

1 Answer

Convert 4 2/9 to a decimal


Step 1: Find a number you can multiply by the bottom of the fraction to make it 10, or 100, or 1000, or any 1 followed by 0s. Step 2: Multiply both top and bottom by that number. Step 3. Then write down just the top number, putting the decimal place in the correct spot (one space from the right for every zero in the bottom number) Example 1: Express 3/4 as a Decimal Step 1: We can mulitply 4 by 25 to become 100
Step 2: Multiply top and bottom by 25:
×25 left-up-over-arrow.gif 3 = 75

4 100 left-under-over-arrow.gif ×25 Step 3: Write down 75 with the decimal place 2 spaces from the right (because 100 has 2 zeros);
Answer = 0.75

Example 2: Express 3/16 as a Decimal Step 1: We have to mulitply 16 by 625 to become 10,000
Step 2: Multiply top and bottom by 625:
×625 left-up-over-arrow.gif 3 = 1,875

16 10,000 left-under-over-arrow.gif ×625 Step 3: Write down 1875 with the decimal place 4 spaces from the right (because 10,000 has 4 zeros);
Answer = 0.1875

Example 2: Express 1/3 as a Decimal Step 1: There is no way to multiply 3 to become 10 or 100 or any power of 10, but we can calculate an approximate decimal by choosing to multiply by, say, 333
Step 2: Multiply top and bottom by 333:
×333 left-up-over-arrow.gif 1 = 333

3 999 left-under-over-arrow.gif ×333 Step 3: Now, 999 is nearly 1,000, so let us write down 333 with the decimal place 3 spaces from the right (because 1,000 has 3 zeros):
Answer = 0.333 (accurate to only 3 decimal places !

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I need to convert decimals to fractions


Hello,
Press [MATH][1:ToFrac] to convert an aswer to fraction.
If you enter 18.52[ToFrac] [ENTER gives 463/25

[MATH][2:ToDEC] converts a fraction to a decimal number.
Hope it helps.

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1 Answer

When I multiply a decimal, I get a fraction.


Hello,
To convert from decimal to fraction and vice versa pess the [S<->D] key. Alternatively, if one of the whole numbers (integers) has decimal mark (dot) the result will be decimal.
Hope it helps.

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2 Answers

Problems with fractions on the Casio fx-115es


Hello,
To convert fractions to decimals or decimals to fractions, you use the [S<->D] key. Each time you press the key the result is displayed in the other format.
Alternatively, If you multiply or divide two integer numbers put a decimal mark at the end of one of the numbers (any one). The result will be displayed in decimal format.

Hope it helps.

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(1/2)(1/3)>Frac
1/6

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