18/1312 = 9/656.
This bit is to make up the mandatory number of words for an answer.
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1.312 = 1312/1000 = 164/125 which cannot be simplified further.
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 2, 18/20 is equal to 9/10 or nine tenths.
An improper fraction is where the numerator (number on top) is greater than the denominator (number on bottom). Your fraction 12/18 is proper, but it is not simplified. The simplified form is 2/3, which in decimal is 0.66666....
Proper Fractions:a fraction in which the numerator is smaller than the denominator such as:6/9 or 4/7...improper fraction:a fraction in which the numerator is bigger than the denominator such as: 18/4 or 97/3. Improper fractions are normally used when converting fractions.
Expressed as a decimal fraction, this is equal to 0.1 recurring (that is, 0.1111...). Expressed as a proper fraction in its simplest form, 2/18 is equal to 1/9 or one ninth.