How do you change 4.5 into a fraction?

##4 1/2## Look at how I did it!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ##color(red)("Note: " 0.1 = 1/10 " so " 0.5 " is " 5/10 ;) " " color(green)( 0.01 = 1/100;" "0.001 = 1/1000)##

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##4.5 " is " 4 + 5/10 ##

Note that by dividing both the top and bottom by the same value I am keeping the ratio the same. So mathematically I can do this!

and ##(color(red)(5 divide 5))/(color(blue)(10 divide 5)) =(color(red)(1))/(color(blue)(2)##

##4.5 = 4 5/10 = 4 1/2##