Multiply both the numerator and denominator by 10 for each digit after the decimal point.
Scroll down to customize the precision point enabling 0.21 to be broken down to a specific number of digits.
The page also includes information about the different type of fractions and what type of fraction 0.21 is when converted.
The level of precision are the number of digits to round to. Select a lower precision point below to break decimal 0.21 down further in fraction form. The default precision point is 5. If the last trailing digit is "5" you can use the "round half up" and "round half down" options to round that digit up or down when you change the precision point.
For example 0.875 with a precision point of 2 rounded half up = 88/100, rounded half down = 87/100.
0.21 = 0 21/100
numerator/denominator = 21/100
A mixed number is made up of a whole number (whole numbers have no fractional or decimal part) and a proper fraction part (a fraction where the numerator (the top number) is less than the denominator (the bottom number). In this case the whole number value is empty and the proper fraction value is 21/100.
Not all decimals can be converted into a fraction. There are 3 basic types which include:
Terminating decimals have a limited number of digits after the decimal point.
Example: 4962.9133 = 4962 9133/10000
Recurring decimals have one or more repeating numbers after the decimal point which continue on infinitely.
Example: 344.3333 = 344 3333/10000 = 333/1000 = 33/100 = 1/3 (rounded)
Irrational decimals go on forever and never form a repeating pattern. This type of decimal cannot be expressed in fraction form.
You can also see the reverse conversion I.e. how fraction 21/100 is converted into a decimal.
Click any decimal to see it as a fraction:
Click any decimal to see the converted fraction value:
Click a decimal to convert into a fraction: