How do you write 1.25 into a fraction?

Answer 1

1.25 = 125/100 = 5/4

Assume for a moment that we don't just already know that 0.25 is the fraction ¼ [like a quarter is 25 cents, or 0.25 dollars, and there are 4 quarters in a dollar, so a quarter is 1/4 of a dollar, for example]. So let's figure it out. Let the fraction be N/D so N is the numerator, and D is the denominator. So 1.25 = N/D and then multiply both sides by D, so D*1.25 = N. So if we choose D = a power of ten so that D*1.25 is an integer, so N will be that integer. Let D = 100, and N = 125. So the fraction is 125/100. The Greatest Common Factor between 125 and 100 is 25. so divide both top and bottom by 25, to get 5/4. This is an improper fraction. The mixed number is 1¼

Answer 2

0.125 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 125/1000 which can be simplified. But simplification means that you lose information about the precision of the fraction.