How can you turn 3.5 into a fraction?

Method one: you can write it as 3 and 5/10 then you can say 3 is 30/10 so we add them and we have 35/10 or if you want 7/2 Method two: look at 3.5 and 3 and 5/10 and say that 5/10 is 1/2 so we have 3 and 1/2 now 3 is 6/2 so we have 7/2. We get the same answer as in the first method. Method three: 3.5/1 is the same as 3.5 since dividing by 1 does not change anything. Now multiply the top and bottom (numerator and denominator) by 10 to clear the decimal and we have 35/10. Now finish up as in method one. Method four: Some people just look at .5 and say in their head that is 1/2 so they know right away that 3.5 is 3 and 1/2 and that is 7/2. With some practice, almost anybody can do it this way!