There is a nifty short cut method to change recurring decimals into fractions:
If all the digits recur
Write a fraction as :
#("the recurring digit(s)")/( 9" for each recurring digit")#
Then simplify if possible to get simplest form.
#0.55555..... = 0.bar5 = 5/9#
#0.272727... = 0.bar(27)= 27/99 = 3/11#
#0.bar(32) = 32/99#
#3.bar(732) = 3 732/999= 3 244/333#
If only some digits recur
Write a fraction as:
#("all the digits - non-recurring digits")/(9 " for each recurring " and 0 " for each non-recurring digit")#
#0.654444... = 0.65bar4 = (654-65)/900 = 589/900#
#0.85bar(271) = (85271-85)/99900 = 85186/99900 = 42593/49950#
#4.167bar(4) = 4 (1673-167)/9000 = 4 1506/9000= 4 251/1500#