if u have repeating decimals...
0.6 (with the 6 repeating)......if there is 1 number repeating, u put that number over 9.....6/9
0.67.(with the 67 repeating)...if there is 2 numbers repeating, u put those 2 numbers over 99.....67/99
0.678 (with the 678 repeating)...if there is 3 numbers repeating, u put those 3 numbers over 999....678/999
