1. Write the decimal down, then divide it by the number 1. For example, if you have the decimal 0.55, draw a line beneath it to show "divided by, then place a 1 underneath to
http://www.ehow.com/how_8091036_calculatedecimals...

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
http://wiki.answers.com/Q/Is+their+a+fraction+to+d...

Not all decimals can we written as fractions. For example, any irrational numbers (such as pi) cannot be written as a fraction. Assuming you are referring to rational numbers only
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Take the decimal and divide it by 1. ChaCha again soon!
http://www.chacha.com/question/howdoichangead...
