Most numbers used in business are based on 10 – commonly known as the decimal system. One dollar is $1.00 and a half-dollar is $0.50. Time, of course, is an exception because it's based on 12. The day ...

Dot notation is used with recurring decimals. The dot above the number shows which numbers recur, for example \(0.5\dot{7}\) is equal to 0.5777777... and \(0.\dot{2}\dot{7}\) is equal to 0.27272727 ...