There are 10 2/3 tablespoons in 2/3 cup. Two-thirds of a tablespoon is equal to 2 teaspoons. There is 1 fluid ounce per 2 tablespoons; thus, there are 5 1/3 fluid ounces per 2/3 cup.
The tablespoon is a U.S. unit of measure equal to 3 teaspoons and equivalent to approximately 15 milliliters in the metric system. Tablespoons were first used as dining utensils with a volume ranging from 7 to 14 milliliters but were later standardized for culinary uses to the current measure. When measuring with a tablespoon, the distinction is made between a level tablespoon and a heaping or rounded tablespoon.