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Now that we know how many fluid ounces and milliliters there are in a teaspoon and a tablespoon, we can count easily how many teaspoons in a tablespoon: 1  1 US tablespoon has 3 teaspoons. 2  1 Australian tablespoon has 4 teaspoons.
There are 10 tablespoons plus 2 teaspoons in 2/3 cup. Each 1/3 cup is equivalent to 5 tablespoons plus 1 teaspoon, so 1 cup is equivalent to 16 tablespoons.