Among common biological substances, all the simple carbohydrates are sweet to at least some degree. Sucrose (table sugar) is the prototypical example of a sweet substance. Sucrose has a sweetness rating of 100, and other substances are rated relative to this. Maltose has a sweetness rating of 30-50 and lactose has a sweetness rating of 20. Thus from the above the degree of relative sweetness follows the order sucrose>maltose>lactose.