Because we do spreadsheets on the move. Because we simply need numpad. Because we didn't buy a Surface. Microsoft has launched a new keyboard on Android, expressly made for Excel, with the main keyboard being truncated to make space for an unassumingly simple number pad, although there's no pluses or minuses. Alas, it's built for tablets, meaning it's incompatible with 'mere' 5-inch Android smartphones -- even if those devices, too, are aching to do expenses in transit.