You can change a fraction into a decimal by dividing.
example: 1/2=2devided by1 = 0.5
Changing back is...
example: because there is one digit before the decimal point you go and change it to 5/10. If there was two digits like 0.05, it wouldn't been 5/100. Then you just simplify it.
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You can change a decimal into a fraction or a percentage
To change a proper fraction into a decimal, divide the denominator into the numerator.
0.25 into a decimal fraction = 25/100
A trick for changing a decimal to a fraction is to say it aloud and write it out as how it says like for example .4 = 4/10 and you can simplify it. That would be a way you can change a decimal to a fraction.
Change the percentage to a decimal by taking the percent and pitting it behind the decimal and to change it to a fraction put the percent under 100