A cup is 8 ounces, divided by 10, means that you are trying to measure 0.8 ounces. A tablespoon is 0.5 ounces and a teaspoon rounded off is 0.17 ounces. So, you need one tablespoon and 2 teaspoons to make 1/10 of a cup. (0.5 + 0.17 + 0.17 = 0.84)