If the calculator has special keys for calculations with fractions, entering a fraction and pressing the fraction key again normally works - but in any case, you can check the manual for your specific calculator.
Something that should work in any calculator is to simply divide the numerator by the denominator. Example: What is the decimal equivalent of 2/3? Just divide 2 by 3, and you should get an answer similar to 0.6666666667.
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A calculator can convert numbers that appear as decimals into numbers that appear as fractions. Fractions are generally considered more easy to use then decimals.
Yes. Convert the fractions to a common denominator, then you can easily compare. Or convert them to decimals - that's easy with a calculator. That also lets you compare easily.
You can always convert a fraction to a decimal. For some fractions, you'll get terminating decimals. For example, 1/8 = 0.125. For other fractions, you get repeating decimals, such as 1/7 = 0.142857 142857 142857...To convert the fraction to a decimal, just divide the numerator by the denominator, for example on a calculator.
It really doesn't matter whichever one you are more comfortable with. fractions are a bit more challenging to convert.
They can show the same number, just in different ways. You can convert fractions into decimals or decimals into fractions.