If it is simple calculators, input in the following order: (for a fraction a/b)
1) a
2) division sign
3) b.
Easy. You'll get the decimal form of the fraction though.
To change a decimal to a fraction,
for a decimal number 0.CD,
1) 0.CD / 1
2) CD /100
3) divide CD and 100 by the same number if there's any common factor.
If it is a scientific calculator:
Use the button "a]b]c".
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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.
18.5. You should get a calculator that can do fractions or use wolframalpha.com
To convert an improper fraction to a decimal, simply do long division or use a calculator to divide. eg. 15/8 = 1.875
Check the manual of your specific calculator. What I have seen is usually something like the following: The calculator tends to automatically show fractions as mixed fractions. The calculator has a "fraction" key, often labelled ab/c. Pressing the "shift" key (or some similar key for "extra functions") followed by the fraction key will often to the desired conversion in the other way (from mixed to improper).
Divide the denominator into the numerator. Multiply the answer by 100.