When watching the UK Channel 4 coverage of the Formula 1 Grand Prix qualifying, I often hear the commentator, when referring to a driver having improved his lap time by 0.15 of a second, say "He's improved by a tenth and a half".

A tenth and a half equals three fifths, not three twentieths. If they must insist on using fractions instead of decimal notation, then it would be better to say fifteen hundredths.


DC